Top 20 Private Clinics & Day Surgery Centers 2025

This report forms part of the Ranking News Healthcare Ranking series, which evaluates hospitals, medical institutions, pharmaceutical organizations, medical technology companies, and healthcare systems across global healthcare markets.

Private clinics and day surgery centers have become increasingly important within modern healthcare systems as more procedures shift away from traditional inpatient hospitals toward outpatient, ambulatory, and short-stay care environments. These organizations provide surgical, diagnostic, specialist, and procedural services in settings designed for efficiency, convenience, and lower-acuity care delivery.

Unlike full-service private hospital groups, private clinics and day surgery center operators typically focus on outpatient consultation, diagnostic testing, elective procedures, minimally invasive surgery, endoscopy, ophthalmology, orthopedics, dermatology, fertility, pain management, and other specialist services that do not usually require overnight hospitalization. Their relevance is increasingly tied to patient access, procedure efficiency, physician partnerships, and integration with broader healthcare networks.

The sector has expanded as healthcare systems seek to reduce inpatient pressure, lower procedural costs, shorten recovery times, and improve patient experience. Advances in anesthesia, imaging, surgical technology, robotics, endoscopy, and post-operative monitoring have allowed more procedures to be performed safely in outpatient settings.

This ranking identifies private clinic and day surgery center platforms whose operating models demonstrate sustained relevance across outpatient surgery, specialist care, diagnostics, physician alignment, and healthcare system capacity. Rather than focusing only on facility count, the objective is to recognize organizations whose ambulatory care platforms play a meaningful role within the global healthcare ecosystem.

Market Overview

The private clinic and day surgery center sector continues to grow as patients, insurers, employers, and healthcare systems increasingly prioritize accessible, efficient, and lower-cost care settings. Ambulatory surgery centers and specialist clinic networks are now central to the delivery of procedures that historically took place in hospital operating rooms.

In the United States, ambulatory surgery center operators have become major healthcare platforms. The largest operators include United Surgical Partners International, SCA Health, AmSurg, HCA Healthcare, and Surgery Partners. Industry analysis in 2024 identified USPI, SCA Health, and AmSurg as the three largest operators by number of ambulatory surgery centers, with approximately 520, 320, and 250 centers respectively.

In Europe, private clinic and outpatient care networks are increasingly integrated into broader private healthcare systems. Groups such as Ramsay Santé combine hospitals, clinics, primary care, imaging, and outpatient services across several European markets. Ramsay Santé describes itself as operating hundreds of hospitals, clinics, primary care, and imaging centers across France, Sweden, Norway, Denmark, and Italy.

Private clinics and day surgery centers are especially important in specialties where procedure volumes are high and inpatient admission is often unnecessary. These include orthopedics, ophthalmology, gastroenterology, pain management, ear-nose-throat surgery, plastic surgery, gynecology, urology, dermatology, fertility, and diagnostic imaging.

The sector also benefits from strong alignment with physicians. Many leading platforms operate through joint ventures, physician partnerships, or specialist-led clinic networks. This structure allows operators to combine clinical expertise, referral relationships, operating discipline, and capital investment in modern procedure facilities.

At the same time, private clinics and day surgery centers face regulatory and operational pressures. Patient safety, anesthesia standards, infection control, payer negotiations, staffing availability, physician retention, and procedure migration policies all influence long-term performance. Platforms with scale, strong governance, specialty depth, and payer integration remain best positioned within the evolving outpatient care market.

Industry Trend — 2025

The private clinic and day surgery center industry in 2025 reflects a continuing shift from inpatient care toward ambulatory, lower-acuity, and specialist-led care models. This shift is driven by medical technology, payer incentives, patient preference, public-system capacity constraints, and the need for more efficient procedural infrastructure.

Outpatient surgery remains the core growth driver. Procedures in orthopedics, ophthalmology, gastroenterology, pain management, urology, gynecology, and ear-nose-throat care continue to migrate toward ambulatory settings. Improved anesthesia protocols, minimally invasive techniques, enhanced recovery pathways, and better post-operative monitoring have increased the range of procedures suitable for day surgery.

Consolidation is another defining trend. Large operators continue to acquire or partner with independent centers, physician groups, and regional clinic networks. In the United States, the largest ASC platforms have continued to build national scale, while many independent centers remain attractive partnership targets. Becker’s ASC identified USPI as the largest U.S. ASC company in 2025, with ownership interests in 520 ASCs and 25 surgical hospitals across 37 states.

Digital integration is reshaping the patient journey. Leading clinic and surgery center operators are investing in online scheduling, pre-operative assessment platforms, remote follow-up, electronic medical records, revenue-cycle automation, patient portals, and analytics for capacity management. These tools allow outpatient platforms to improve convenience while reducing administrative friction.

Specialty focus is becoming more important. Rather than operating only as generic procedure centers, leading platforms increasingly differentiate through orthopedic centers of excellence, ophthalmology networks, fertility clinics, endoscopy platforms, cancer diagnostics, dermatology chains, and musculoskeletal care models.

As healthcare systems continue to seek alternatives to inpatient hospital care, private clinic and day surgery center operators with strong physician partnerships, efficient facility networks, clinical governance, and payer access remain well positioned for long-term relevance.

Methodology — Core Eligibility Criteria

To ensure structural consistency within the category, organizations considered for this ranking were evaluated based on the following eligibility conditions:

• Operates primarily as a private clinic network, ambulatory surgery center platform, day surgery center operator, or outpatient specialist care group
• Provides outpatient surgery, specialist consultation, diagnostics, procedural care, or short-stay treatment services
• Maintains meaningful institutional scale through multi-site operations, physician partnerships, regional networks, or specialty concentration
• Demonstrates relevance in private, insured, self-pay, employer-sponsored, or mixed-pay outpatient healthcare markets
• Maintains established systems for clinical governance, patient safety, operating room management, and outpatient care delivery

Full-service hospital groups whose primary identity is inpatient acute care, public-sector hospital authorities, standalone single-site clinics, and organizations primarily focused on insurance, pharmaceuticals, or medical devices were generally excluded unless they operate a clearly identifiable outpatient surgery or clinic platform.

Methodology — Ranking Factors

Organizations included in the ranking were evaluated using a combination of qualitative and structural considerations rather than short-term financial performance metrics. Key factors considered include:

• Scale and geographic reach of the clinic or day surgery network
• Breadth of outpatient surgical, diagnostic, and specialist services
• Strength of physician alignment and partnership structures
• Role in shifting care from inpatient hospitals to outpatient settings
• Clinical governance, patient safety systems, and procedural quality infrastructure
• Technology adoption, digital access, and operating efficiency
• Market relevance within private, insured, and self-pay healthcare systems
• Institutional stability, brand reputation, and long-term platform resilience

The objective of the ranking is to identify private clinic and day surgery center operators whose outpatient care platforms maintain sustained relevance within the global healthcare ecosystem.

The Healthcare Ranking Top 20 Private Clinics & Day Surgery Centers 2025 ranking evaluates private outpatient healthcare operators serving patients through ambulatory surgery, specialist consultation, diagnostic, procedural, and short-stay care platforms.

The ranking universe consisted of approximately 100 private clinic and day surgery center operators globally, from which 20 institutions were selected for inclusion.

Tier classifications reflect relative institutional positioning within the private clinic and day surgery center segment and do not represent clinical outcome rankings, patient recommendations, or investment recommendations.

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Tier I — Leading Private Clinic & Day Surgery Platforms

United Surgical Partners International

• Headquarters: Dallas, United States
• Founded: 1998

United Surgical Partners International, part of Tenet Healthcare, is one of the largest ambulatory surgery center platforms in the world. The company operates through partnerships with physicians and health systems, focusing on outpatient surgical procedures, short-stay care, and specialist procedural services.

USPI’s scale gives it a defining position in the U.S. ambulatory surgery center market. Industry sources identify USPI as the largest U.S. ASC operator, with approximately 520 ambulatory surgery centers and a broad national footprint.

The platform’s strength lies in its physician partnership model, large procedural network, payer relationships, and integration with Tenet’s broader healthcare services. Its centers cover specialties including orthopedics, gastroenterology, ophthalmology, pain management, urology, gynecology, and general surgery.

As more procedures migrate away from inpatient hospitals, USPI remains one of the most strategically important platforms in outpatient surgery. Its operating scale, physician alignment, and national reach support its position as a leading private clinic and day surgery center operator in 2025.

SCA Health

• Headquarters: Deerfield, United States
• Founded: 2007

SCA Health, part of Optum, is one of the largest ambulatory surgery and specialist care platforms in the United States. The organization operates surgery centers and surgical hospitals through partnerships with physicians, health systems, and payers.

SCA Health’s strategic importance is reinforced by its connection to Optum and UnitedHealth Group, giving it a distinctive position at the intersection of outpatient surgery, physician networks, health plans, and value-based care. Industry analysis identifies SCA Health as one of the largest ASC operators in the United States, with approximately 320 centers as of year-end 2024.

The company’s platform supports a wide range of procedures across orthopedics, ophthalmology, gastroenterology, pain management, urology, and other specialties. Its model emphasizes alignment among surgeons, facility operators, health systems, and payers.

SCA Health’s scale, payer integration, physician relationships, and ability to support procedure migration into outpatient settings place it among the leading private clinic and day surgery platforms globally.

AmSurg

• Headquarters: Nashville, United States
• Founded: 1992

AmSurg is a major ambulatory surgery center operator with a long-standing role in outpatient procedural care in the United States. The company is especially associated with gastroenterology, ophthalmology, orthopedics, and multispecialty surgical facilities.

The company’s platform is built around partnerships with physicians and outpatient procedural groups. Industry analysis identified AmSurg as one of the largest ASC operators, with approximately 250 ambulatory surgery centers as of year-end 2024.

AmSurg’s institutional relevance lies in its focused operating model and experience managing high-volume outpatient procedure environments. Its facilities support efficient, lower-acuity care delivery outside traditional hospital settings while maintaining physician-led clinical relationships.

As payers and patients continue to favor ambulatory procedural settings, AmSurg remains one of the most recognized and structurally important platforms in the private day surgery center sector.

Surgery Partners

• Headquarters: Brentwood, United States
• Founded: 2004

Surgery Partners is a major U.S. outpatient surgery and short-stay care operator. The company operates ambulatory surgery centers, surgical hospitals, and related healthcare facilities across multiple states, serving physicians, payers, and patients through a diversified procedural platform.

The group’s specialty mix includes orthopedics, gastroenterology, pain management, ophthalmology, ENT, urology, and general surgery. Its platform is designed to support procedures that can be performed safely in lower-cost, outpatient-oriented settings.

Surgery Partners’ strength lies in its physician partnership model, procedural focus, and positioning within the continuing migration of care from inpatient hospitals to ambulatory centers. The company has developed a meaningful national presence and remains one of the leading independent platforms in the U.S. surgery center market.

Its operating model reflects the broader direction of healthcare delivery: specialized facilities, efficient scheduling, physician alignment, and outpatient procedural growth. These factors support its inclusion among leading private clinic and day surgery platforms.

Ramsay Santé

• Headquarters: Paris, France
• Founded: 1987

Ramsay Santé is one of Europe’s leading private healthcare providers, operating a broad network of hospitals, clinics, primary care facilities, imaging centers, and outpatient services. The group reports approximately 350 establishments across five countries, supported by 36,000 employees and 8,600 practitioners serving millions of patients.

Although Ramsay Santé includes hospital operations, its clinic and outpatient care network gives it a major role in Europe’s private procedural and specialist care markets. The platform covers France, Sweden, Norway, Denmark, and Italy, with services spanning surgery, diagnostics, rehabilitation, mental health, primary care, and specialist consultations.

Ramsay Santé’s strength lies in its regional density, broad care continuum, and ability to combine hospital-based and outpatient services across multiple European healthcare systems. Its presence in mature regulated markets gives it institutional relevance beyond facility count alone.

As European healthcare systems increasingly emphasize proximity care, outpatient treatment, and integrated private capacity, Ramsay Santé remains one of the most important clinic and short-stay care platforms in the region.

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Tier II — Established Private Clinic & Day Surgery Operators

(Alphabetical order)

Alliance Medical Group

• Headquarters: Warwick, United Kingdom
• Founded: 1989

Alliance Medical Group is a major diagnostic imaging and outpatient healthcare provider operating across Europe. The group provides services including MRI, CT, PET-CT, molecular imaging, radiology, and related diagnostic services through partnerships with hospitals, health systems, and private providers.

Although it is not a traditional surgical center operator, Alliance Medical plays an important role in the private clinic ecosystem because advanced diagnostics are central to outpatient care pathways. Its facilities support specialist referrals, cancer diagnostics, imaging-led treatment planning, and early disease detection.

The group’s relevance lies in its scale, imaging expertise, and ability to provide diagnostic capacity outside conventional hospital departments. As healthcare systems increasingly rely on outpatient diagnostics to reduce delays and improve care access, Alliance Medical remains an important specialist clinic platform.

Aspen Healthcare

• Headquarters: London, United Kingdom
• Founded: 1998

Aspen Healthcare is a UK-based private healthcare provider operating hospitals, clinics, and day surgery facilities. Its platform includes specialist facilities focused on elective surgery, diagnostics, outpatient consultation, and short-stay care.

The group provides services across orthopedics, ophthalmology, general surgery, gynecology, ENT, urology, endoscopy, cosmetic surgery, diagnostics, and physiotherapy. Its facilities serve self-pay, insured, and selected NHS-funded patients.

Aspen Healthcare’s strength lies in its specialist facility model and focus on private procedural care in the UK market. As patients seek alternatives to long public waiting times and insurers support efficient treatment pathways, Aspen’s outpatient and day case services remain structurally relevant.

ELSAN

• Headquarters: Paris, France
• Founded: 2015

ELSAN is one of France’s leading private healthcare groups, operating hospitals, clinics, maternity units, imaging centers, and outpatient care facilities across the country. The group has a significant presence in private surgery, specialist consultation, medical imaging, oncology-related services, and short-stay care.

Although ELSAN includes inpatient hospital activity, its network of private clinics and surgical facilities gives it a strong position in the French outpatient and day surgery market. Its facilities serve patients across multiple specialties, including orthopedics, ophthalmology, gynecology, urology, digestive surgery, and cardiology.

ELSAN’s institutional relevance reflects its national footprint, clinician partnerships, regional presence, and role within France’s private healthcare system. Its scale and specialty breadth support its position among established private clinic and day surgery operators.

HCA Healthcare Ambulatory Surgery Division

• Headquarters: Nashville, United States
• Founded: 1968

HCA Healthcare operates a substantial ambulatory surgery and outpatient care platform alongside its broader hospital network. Although HCA is best known as one of the world’s largest private hospital operators, its outpatient surgery centers and ambulatory facilities represent a major component of its healthcare delivery model.

The group’s outpatient platform supports surgical procedures, diagnostics, urgent care, imaging, physician practices, and specialist services. Its scale allows HCA to coordinate patient pathways across hospitals, outpatient centers, emergency facilities, and physician networks.

HCA’s strength in the clinic and day surgery segment lies in its integration. The company can shift appropriate procedures to outpatient settings while maintaining access to hospital infrastructure for more complex care. This gives it an important role in the broader migration of care from inpatient to ambulatory environments.

Healius

• Headquarters: Sydney, Australia
• Founded: 1985

Healius is an Australian healthcare company focused on pathology, diagnostic imaging, and day hospital services. Its platform supports outpatient diagnostics, specialist care pathways, and selected procedural services across the Australian healthcare market.

The company’s role in private clinics is especially relevant in diagnostics, where pathology and imaging are foundational to outpatient medicine. Healius provides services to patients, physicians, hospitals, and healthcare organizations, supporting early diagnosis, specialist referral, treatment monitoring, and preventive care.

Healius’ institutional strength lies in its national footprint and diagnostic infrastructure. As healthcare systems increasingly shift toward early detection, outpatient testing, and data-supported care, diagnostic clinic platforms such as Healius remain important participants in the private healthcare ecosystem.

Medicover

• Headquarters: Stockholm, Sweden
• Founded: 1995

Medicover is an international healthcare and diagnostic services provider with operations across Europe and selected emerging markets. The group provides outpatient clinics, diagnostic services, hospitals, fertility services, and specialist care in markets including Poland, Romania, India, Germany, and other countries.

Medicover’s clinic-centered model gives it a strong position in private and employer-sponsored healthcare. Its services include primary care, specialist consultations, diagnostics, laboratory testing, imaging, dentistry, fertility, and selected hospital services.

The group’s strength lies in its integrated outpatient platform and exposure to growing private healthcare demand in Central and Eastern Europe. Its model combines accessible private clinics with diagnostics and subscription-style healthcare services, making it a distinctive participant in the private clinic sector.

Optegra Eye Health Care

• Headquarters: London, United Kingdom
• Founded: 2007

Optegra Eye Health Care is a specialist ophthalmology clinic and day surgery platform focused on eye care, cataract surgery, refractive surgery, glaucoma treatment, retinal services, and other ophthalmic procedures. The group operates private eye hospitals and clinics in the United Kingdom and selected international markets.

Its focused model reflects the increasing importance of specialty-specific outpatient surgery platforms. Ophthalmology is particularly suited to day surgery settings because many procedures can be performed efficiently without overnight admission.

Optegra’s strength lies in its dedicated eye care infrastructure, specialist surgeons, procedure volume, and patient-facing brand. As cataract, refractive, and retinal care demand continues to grow with aging populations and technology adoption, ophthalmology-focused platforms remain well positioned.

Sonic Healthcare

• Headquarters: Sydney, Australia
• Founded: 1987

Sonic Healthcare is one of the world’s leading diagnostic medicine companies, with major operations in laboratory medicine, pathology, radiology, and clinical diagnostics. While not a conventional day surgery operator, Sonic is highly relevant to the private clinic sector because diagnostics form the infrastructure for outpatient care, specialist medicine, and preventive health.

The company operates across Australia, Europe, the United States, and other markets, providing laboratory and diagnostic services to physicians, clinics, hospitals, and patients. Its pathology and imaging platforms support diagnosis, monitoring, screening, and clinical decision-making across many specialties.

Sonic Healthcare’s global footprint, medical governance model, and diagnostic specialization place it among the most important private outpatient healthcare platforms. Its inclusion reflects the central role of diagnostic clinic networks in modern ambulatory medicine.

Spire Healthcare Clinics & Day Case Services

• Headquarters: London, United Kingdom
• Founded: 2007

Spire Healthcare operates a national network of private hospitals, clinics, and medical centers in the United Kingdom. Although it is also a private hospital group, Spire’s outpatient clinics and day case services are an important component of the UK private healthcare market.

The group provides specialist consultations, diagnostics, physiotherapy, minor procedures, endoscopy, ophthalmology, orthopedics, and day surgery services. Its platform serves insured, self-pay, and NHS-funded patients.

Spire’s relevance to this category lies in its ability to combine consultant-led outpatient access with day case surgical capacity. As UK patients increasingly seek faster access to procedures and specialist opinions, Spire’s clinic and day surgery services remain an important part of independent healthcare delivery.

ValueHealth

• Headquarters: Leawood, United States
• Founded: 1997

ValueHealth is a U.S.-based ambulatory care company focused on outpatient surgical facilities, specialty care networks, and value-based care models. The company works with physicians, health systems, and payers to develop and operate ambulatory surgery centers and surgical programs.

Its model reflects the movement toward site-of-care optimization, where procedures are shifted from high-cost hospital settings to lower-cost outpatient facilities when clinically appropriate. ValueHealth has emphasized bundled payments, surgical specialty programs, and partnerships that align incentives among physicians, payers, and patients.

The company’s relevance lies in its focus on value-based outpatient surgery and its role in developing ambulatory alternatives to hospital-based procedural care. As payers seek more efficient surgical models, ValueHealth remains a notable specialist platform in the private clinic and day surgery center market.

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Tier III — Specialist Private Clinic & Day Surgery Operators

(Alphabetical order)

• Affidea
• CHEC Healthcare
• Horder Healthcare
• Laser Clinics Group
• Schoen Clinic

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Remarks

Private clinics and day surgery centers continue to expand their influence within global healthcare as outpatient procedures, diagnostics, specialist consultations, and short-stay treatment become increasingly central to care delivery. These organizations help reduce pressure on inpatient hospitals while offering patients faster access, lower-acuity treatment environments, and more convenient care pathways.

The institutions recognized in this ranking represent organizations whose outpatient care platforms maintain sustained relevance across ambulatory surgery, specialist medicine, diagnostics, physician partnerships, and healthcare system capacity. Tier classification reflects relative institutional positioning within the private clinic and day surgery center sector rather than direct clinical outcome rankings.

Tier classification reflects relative operating scale, outpatient specialization, physician alignment, clinical governance, technology adoption, and market relevance. The ranking does not constitute a medical recommendation, patient referral guidance, investment recommendation, or evaluation of individual physician performance.

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Recognition

Organizations included in the Top 20 Private Clinics & Day Surgery Centers 2025 ranking may request information regarding authorized use of the Ranking News designation for marketing and communications purposes.

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