# 50 leading Medical Practices companies in California

Tamtam tracks 63 Medical Practices companies headquartered in California. This list ranks the 50 largest by number of employees on LinkedIn, led by Sutter Health - Palo Alto Medical Foundation, LaserAway and Landmark Health. Their median headcount is 400. Half of them were founded in 1984 or later. The most common headquarters are Sacramento (3), San Diego (3) and Beverly Hills (2).

These California-based medical practices range from large, established healthcare systems to specialized clinics. Companies like Sutter Health - Palo Alto Medical Foundation provide comprehensive care across Northern California, while Sharp Rees-Stealy Medical Group offers primary and specialty services in San Diego. LaserAway specializes in aesthetic dermatology, and Landmark Health delivers in-home medical care for adults with chronic illnesses. SkinSpirit focuses on medical aesthetics, and The Oncology Institute provides advanced oncology care. Most of these organizations are well-established, with many founded before 2000.

A notable pattern among these companies is their diverse geographic distribution across California, from Southern California cities like San Diego, Beverly Hills, and Huntington Beach, to Northern California locations such as Palo Alto and Emeryville. This indicates a broad presence of medical practices throughout the state, catering to various healthcare needs across different regions.

🇺🇸 California · 50 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Sutter Health - Palo Alto Medical Foundation](https://www.tamtam.ai/c/sutter-health-palo-alto-medical-foundation) (jobs.sutterhealthclinicians.org)<br>A not-for-profit healthcare organization providing operational support and advanced technology for physicians to deliver exceptional patient care in Northern California | Medical Practices | 🇺🇸 Mountain View | 4,394 | 1930 |
| 2 | [LaserAway](https://www.tamtam.ai/c/laseraway) (laseraway.com)<br>Aesthetic dermatology leader offering state-of-the-art treatments for skin rejuvenation, hair removal, body contouring, and injectables with a focus on professional growth and flexibility | Medical Practices | 🇺🇸 Beverly Hills | 1,624 | 2006 |
| 3 | [Landmark Health](https://www.tamtam.ai/c/landmark-health) (business.optum.com)<br>Mobile provider group bringing medical care to homes of adults with chronic illnesses, helping reach health goals, reducing hospital stays, admissions, mortality rates, and costs | Medical Practices | 🇺🇸 Huntington Beach | 821 | 2013 |
| 4 | [Sharp Rees-Stealy Medical Group](https://www.tamtam.ai/c/sharp-rees-stealy-medical-group) (sharp.com)<br>A leading medical group in San Diego County with 19 locations offering primary, specialty care, therapy, radiology, pharmacy, and urgent care services since 1923 | Medical Practices | 🇺🇸 San Diego | 820 | 1923 |
| 5 | [Sansum Clinic](https://www.tamtam.ai/c/sansum-clinic) (sutterhealth.org)<br>A non-profit organization in Santa Barbara County with 250 physicians providing a full range of healthcare services to over 150,000 patients yearly | Medical Practices | 🇺🇸 Santa Barbara | 769 | 1921 |
| 6 | [SHARP MEMORIAL HOSPITAL](https://www.tamtam.ai/c/sharp-memorial-hospital)<br>A medical practice company located in San Diego, California, specializing in providing healthcare services at Sharp Memorial Hospital | Medical Practices | 🇺🇸 San Diego | 768 | 1955 |
| 7 | [SkinSpirit](https://www.tamtam.ai/c/skinspirit) (skinspirit.com)<br>A premier destination for medical aesthetics and skincare, providing safe and effective treatments with highly trained experts for optimal results | Medical Practices | 🇺🇸 Palo Alto | 656 | 2003 |
| 8 | [Riverside Medical Clinic](https://www.tamtam.ai/c/riverside-medical-clinic) (riversidemedicalclinic.com)<br>Providing comprehensive multi-specialty medical services in Riverside region, focusing on qualitatively excellent, accessible, and affordable healthcare for individuals, businesses, and industries | Medical Practices | 🇺🇸 Riverside | 652 | 1935 |
| 9 | [CEP America](https://www.tamtam.ai/c/cep-america) (vituity.com)<br>A leading acute care expert formed from the unification of subsidiaries, focused on transforming acute care and improving patient lives | Medical Practices | 🇺🇸 Emeryville | 560 | 1975 |
| 10 | [Los Alamitos Medical Center](https://www.tamtam.ai/c/los-alamitos-medical-center) (ucihealth.org)<br>A healthcare provider in Orange County offering high-quality care through top physicians, surgeons, and clinical staff, now a part of UCI Health | Medical Practices | 🇺🇸 Los Alamitos | 526 |  |
| 11 | [SAN](https://www.tamtam.ai/c/san)<br>Providing top-notch healthcare services to the community without regard to socioeconomic status is our primary goal at SAN | Medical Practices | 🇺🇸 Chula Vista | 506 | 1982 |
| 12 | [Northeast Valley Health Corporation](https://www.tamtam.ai/c/northeast-valley-health-corporation) (nevhc.org)<br>A nonprofit community health center in Los Angeles County providing quality healthcare to medically underserved residents with sensitivity to diverse needs | Medical Practices | 🇺🇸 San Fernando | 502 | 1973 |
| 13 | [The Oncology Institute](https://www.tamtam.ai/c/the-oncology-institute) (theoncologyinstitute.com)<br>Advanced oncology care provider offering evidence-based treatment, clinical trials, and specialized care in a community setting, impacting over 17 million patients | Medical Practices | 🇺🇸 Cerritos | 493 | 2007 |
| 14 | [St. Jude Medical Center](https://www.tamtam.ai/c/st-jude-medical-center) (providence.org)<br>A highly esteemed non-profit hospital in Southern California known for its advanced technology and exceptional care services | Medical Practices | 🇺🇸 Fullerton | 478 | 1957 |
| 15 | [SAN FRANCISCO VA MEDICAL CENTER](https://www.tamtam.ai/c/san-francisco-va-medical-center)<br>A medical practice company located in Suisun City, California, providing services at the SAN FRANCISCO VA MEDICAL CENTER in United States | Medical Practices | 🇺🇸 Suisun City | 472 |  |
| 16 | [Alta Bates Summit Medical Center, Inc.](https://www.tamtam.ai/c/alta-bates-summit-medical-center-inc) (sutterhealth.org)<br>A not-for-profit hospital in Oakland and Berkeley, part of the Sutter Health network, providing healthcare services to patients | Medical Practices | 🇺🇸 Berkeley | 463 | 1936 |
| 17 | [Prenuvo](https://www.tamtam.ai/c/prenuvo) (prenuvo.com)<br>A health tech company specializing in whole body MRI screening for early detection of cancer and other diseases using cutting-edge technology and AI analysis | Medical Practices | 🇺🇸 Redwood City | 462 |  |
| 18 | [Hoag Medical Group](https://www.tamtam.ai/c/hoag-medical-group) (hoagmedicalgroup.com)<br>Healthcare organization offering a wide range of specialties, personalized care, same-day appointments, convenient locations, and acceptance of various insurance plans | Medical Practices | 🇺🇸 Newport Beach | 453 | 2012 |
| 19 | [Olive View - UCLA Medical Center](https://www.tamtam.ai/c/olive-view-ucla-medical-center-sylmar) (uclaoliveview.org)<br>Training compassionate physicians in internal medicine, our residency program emphasizes clinical excellence and serving the underserved population in Los Angeles County | Medical Practices | 🇺🇸 Sylmar | 442 | 1987 |
| 20 | [USC Verdugo Hills Hospital](https://www.tamtam.ai/c/usc-verdugo-hills-hospital) (keckmedicine.org)<br>Providing personalized healthcare in Southern California, USC Verdugo Hills Hospital is affiliated with USC and part of Keck Medicine of USC | Medical Practices | 🇺🇸 Glendale | 429 | 1947 |
| 21 | [NVISION Eye Centers](https://www.tamtam.ai/c/nvision-eye-centers) (nvisioncenters.com)<br>Leader in LASIK and cataract surgery across the US, offering top technology and experienced surgeons for the best patient experience in eye care | Medical Practices | 🇺🇸 Aliso Viejo | 428 | 1999 |
| 22 | [Wesley Health Centers - JWCH Institute, Inc.](https://www.tamtam.ai/c/wesley-health-centers-jwch-institute-inc) (jwchinstitute.org)<br>A leading healthcare provider in Los Angeles, offering comprehensive services to underserved populations including the homeless, regardless of ability to pay | Medical Practices | 🇺🇸 Los Angeles | 418 | 1960 |
| 23 | [Santa Barbara Cottage Hospital](https://www.tamtam.ai/c/santa-barbara-cottage-hospital)<br>A medical practice company located in Santa Barbara, California, providing healthcare services at 400 W PUEBLO ST | Medical Practices | 🇺🇸 Santa Barbara | 413 | 1888 |
| 24 | [Asian Health Services](https://www.tamtam.ai/c/asian-health-services) (asianhealthservices.org)<br>Healthcare organization providing comprehensive services in multiple languages, including medical, dental, mental health, nutrition, and advocacy for diverse communities regardless of status | Medical Practices | 🇺🇸 Oakland | 402 | 1974 |
| 25 | [BASS Medical Group](https://www.tamtam.ai/c/bass-medical-group) (bassmedicalgroup.com)<br>Physician-owned and patient-centered organization providing high quality, cost-effective healthcare services with a focus on community-based independent physician practices in California | Medical Practices | 🇺🇸 Walnut Creek | 400 | 2006 |
| 26 | [Open Door Community Health Centers](https://www.tamtam.ai/c/open-door-community-health-centers) (opendoorhealth.com)<br>A FQHC system in Humboldt and Del Norte counties providing quality healthcare to all, recognized as a National Quality Leader | Medical Practices | 🇺🇸 Arcata | 374 | 1971 |
| 27 | [The Center for Connection](https://www.tamtam.ai/c/the-center-for-connection) (thecenterforconnection.org)<br>A medical practice company based in Pasadena, CA, focused on enhancing human connection and well-being through personalized healthcare services | Medical Practices | 🇺🇸 Pasadena | 352 |  |
| 28 | [CALIFORNIA DEPARTMENT OF CORRECTION/ REHABILITATION](https://www.tamtam.ai/c/california-department-of-correction-rehabilitation)<br>A medical practice company located in Tehachapi, California, specializing in correctional and rehabilitation services for individuals involved with the criminal justice system | Medical Practices | 🇺🇸 Tehachapi | 348 |  |
| 29 | [MAINTENANCE](https://www.tamtam.ai/c/maintenance) (maintenancela.com)<br>Helping individuals maintain their desired appearance through personalized maintenance plans post-treatment or surgery, promoting aging gracefully with specialized services | Medical Practices | 🇺🇸 Beverly Hills | 332 | 2017 |
| 30 | [Radiology Associates](https://www.tamtam.ai/c/radiology-associates) (rasloimaging.com)<br>Radiology Associates provides advanced diagnostic imaging services on the Central Coast, offering fast and effective care with state-of-the-art technology and compassionate staff | Medical Practices | 🇺🇸 Atascadero | 332 | 1959 |
| 31 | [Spine & Sport Physical Therapy](https://www.tamtam.ai/c/spine-and-sport-physical-therapy) (spineandsport.com)<br>Empowering individuals to reach their full potential through personalized physical therapy treatments focusing on pain management, mobility, function, and wellness | Medical Practices | 🇺🇸 San Diego | 328 |  |
| 32 | [Access Health](https://www.tamtam.ai/c/access-health) (myaccesshealth.com)<br>Access Health offers primary and urgent healthcare services in the Bay Area, including treatment for chronic conditions, physical exams, vaccinations, and urgent care for injuries and illnesses | Medical Practices | 🇺🇸 San Mateo | 327 | 2010 |
| 33 | [CALIFORNIA DEPARTMENT OF CORRECTIONS](https://www.tamtam.ai/c/california-department-of-corrections)<br>A medical practice company located in Clovis, California, specializing in corrections-related healthcare services | Medical Practices | 🇺🇸 Clovis | 327 |  |
| 34 | [BUENA PARK SCHOOL DISTRICT](https://www.tamtam.ai/c/buena-park-school-district) (bpsd.k12.ca.us)<br>A school district in Buena Park, CA, providing education to students from Kindergarten to 8th grade | Medical Practices | 🇺🇸 West Sacramento | 255 |  |
| 35 | [Northern Valley Indian Health](https://www.tamtam.ai/c/northern-valley-indian-health) (nvih.org)<br>Provider of health services for American Indians and the general public in various counties through medical, dental, and behavioral health clinics | Medical Practices | 🇺🇸 Willows | 222 | 1971 |
| 36 | [NakedMD](https://www.tamtam.ai/c/nakedmd) (nakedmd.com)<br>Personalized beauty treatments as an art form, enhancing natural beauty for confident, radiant skin Empowering individuals to feel their best | Medical Practices | 🇺🇸 Newport Beach | 196 | 2022 |
| 37 | [HRC Fertility Management](https://www.tamtam.ai/c/hrc-fertility-management) (havingbabies.com)<br>A Managed Services Organization in the fertility industry providing administrative services to medical practices, including clinics, labs, genetics lab, and surgery centers | Medical Practices | 🇺🇸 Pasadena | 185 | 1988 |
| 38 | [Unio Health Partners](https://www.tamtam.ai/c/unio-health-partners) (uniohp.com)<br>A multi-specialty physician practice management company focused on urology, gastroenterology, and radiation oncology offering management services and supporting ancillary service lines | Medical Practices | 🇺🇸 Southern California | 184 | 2021 |
| 39 | [Medical Board Of California](https://www.tamtam.ai/c/medical-board-of-california) (mbc.ca.gov)<br>State agency in California that licenses and disciplines physicians and healthcare professionals, provides public information on licensed physicians, and investigates complaints | Medical Practices | 🇺🇸 Sacramento | 176 | 1876 |
| 40 | [Mercy Medical Group](https://www.tamtam.ai/c/mercy-medical-group) (dignityhealth.org)<br>Mercy Medical Group focuses on ensuring the happiness, health, and well-being of individuals through comprehensive medical care and services | Medical Practices | 🇺🇸 Sacramento | 172 | 2004 |
| 41 | [MCHC Health Centers](https://www.tamtam.ai/c/mchc-health-centers) (mchcinc.org)<br>Community-based healthcare provider offering medical, dental, and behavioral care in Mendocino and Lake Counties, dedicated to providing high-quality healthcare for all | Medical Practices | 🇺🇸 Ukiah | 167 | 1992 |
| 42 | [Rancho Physical Therapy](https://www.tamtam.ai/c/rancho-physical-therapy) (ranchopt.com)<br>A Medicare certified group offering physical, occupational, hand, cardiopulmonary, and speech therapies with a focus on home exercises and patient education | Medical Practices | 🇺🇸 Lake Elsinore | 165 | 1984 |
| 43 | [Children's Dental FunZone!](https://www.tamtam.ai/c/children-s-dental-funzone) (childrensdentalfunzone.com)<br>Pediatric dental practice in Southern California focused on providing a fun and positive experience for children while promoting good oral health | Medical Practices | 🇺🇸 West Covina | 162 | 2002 |
| 44 | [El Proyecto del Barrio, Inc.](https://www.tamtam.ai/c/el-proyecto-del-barrio-inc) (elproyecto.us)<br>A nonprofit organization in Arleta, CA providing health and human services to underserved communities in the United States | Medical Practices | 🇺🇸 Arleta | 161 | 1971 |
| 45 | [VA HOSPITAL LOMA LINDA](https://www.tamtam.ai/c/va-hospital-loma-linda)<br>A medical practice located in Hemet, California offering services at the VA Hospital Loma Linda | Medical Practices | 🇺🇸 Hemet | 158 |  |
| 46 | [LONG BEACH MEMORIAL MEDICAL CENTER/MEMORIAL CHILDREN'S HOSPITAL](https://www.tamtam.ai/c/long-beach-memorial-medical-center-memorial-children-s-hospital)<br>A medical practice company located in Long Beach, California, specializing in providing services at Long Beach Memorial Medical Center and Memorial Children's Hospital | Medical Practices | 🇺🇸 Long Beach | 157 |  |
| 47 | [Sierra Pacific Orthopedics](https://www.tamtam.ai/c/sierra-pacific-orthopedics) (spoc-ortho.com)<br>The company specializes in various areas of orthopedic medicine, including sports medicine, hand and upper extremity care, and nonoperative pain management | Medical Practices | 🇺🇸 Fresno | 155 | 2002 |
| 48 | [Retinal Consultants Medical Group, Inc.](https://www.tamtam.ai/c/retinal-consultants-medical-group-inc) (retinalmd.com)<br>Specializing in diagnosing and treating diseases of the retina and vitreous, this Northern California group has multiple Retina Centers serving various cities | Medical Practices | 🇺🇸 Sacramento | 153 | 1977 |
| 49 | [Coury & Buehler Physical Therapy](https://www.tamtam.ai/c/coury-and-buehler-physical-therapy) (cbphysicaltherapy.com)<br>Dedicated to providing high quality physical therapy care, focusing on relieving pain, retraining movement, restoring function, and empowering patients through education | Medical Practices | 🇺🇸 Brea | 148 | 2004 |
| 50 | [Agile Physical Therapy, Inc.](https://www.tamtam.ai/c/agile-physical-therapy-inc) (agilept.com)<br>Private outpatient physical therapy centers in California, offering sport rehabilitation and employer-based care Emphasis on professional advancement, evidence-based practice, and career-long learning | Medical Practices | 🇺🇸 Palo Alto | 146 | 2002 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 13, 2026.

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## The same list elsewhere in United States

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- [Medical Practices companies in Texas](https://www.tamtam.ai/l/medical-practices-companies-texas) (53)
- [Medical Practices companies in Georgia](https://www.tamtam.ai/l/medical-practices-companies-georgia) (32)
- [Medical Practices companies in Tennessee](https://www.tamtam.ai/l/medical-practices-companies-tennessee) (28)
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- [Medical Practices companies in New York](https://www.tamtam.ai/l/medical-practices-companies-new-york) (27)

## The same list elsewhere

- [Medical Practices companies in the world](https://www.tamtam.ai/l/medical-practices-companies-in-the-world) (1,268)

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Source: https://www.tamtam.ai/l/medical-practices-companies-california