Quick answers
- Does Mammoth Hospital have an emergency room?
- Yes. Medicare (CMS) data lists emergency services at Mammoth Hospital. In a medical emergency, call 911.
- Where is Mammoth Hospital?
- 85 Sierra Park Road PO Box 660, Mammoth Lakes, CA 93546, in Mono County, California.
- What is the phone number of Mammoth Hospital?
- (760) 934-3311, as listed by Medicare (CMS).
- What is the Medicare star rating of Mammoth Hospital?
- CMS does not show an overall star rating for this hospital. This is common, for example when a hospital reports too few quality measures or is not part of the rating program.
Specialties and care areas[4][5][6][7]
- Family medicine
- Orthopedics
- General surgery
- Laboratory
- Emergency medicine
- Orthopedics and sports medicine
- Medical imaging / radiology
- Physical therapy
Conditions treated[6][7]
- Hip, knee and shoulder pain
- Ligament tears
- Joint dislocations
- Sprains and strains
- Fractures and orthopedic trauma
- Spine conditions
- Hand conditions
- Foot and ankle conditions
- Arthritis
- Tendonitis
- Overuse injuries
- Cuts and lacerations
- Osteoporosis (bone density monitoring)
Treatments[5][6][7]
- Non-surgical orthopedic care
- Physical therapy
- Orthopedic injections
- Bracing
- Sports medicine treatments including biologic therapies
- Fracture and trauma care
- Rehabilitation
- Image-guided pain management injections
- 24/7 emergency care
Procedures[6][7][8]
- Joint replacement surgery (robotic-assisted and minimally invasive options)
- Trauma surgery
- Colonoscopy and colon cancer screening
- Upper and lower endoscopy (EGD)
- Laparoscopic surgery
- Hernia repair
- Cholecystectomy (gallbladder removal)
- Hemorrhoidectomy
- Mole and skin lesion removal
- Appendectomy
- Colon and intestinal surgery
- Gastroesophageal reflux surgery
- Hyperhidrosis surgery
- Thoracoscopy
- CT scan
- MRI
- Ultrasound
- Ultrasound-guided breast biopsy
- X-ray and fluoroscopy
- 3D mammography
- Bone density (DEXA) scan
- Echocardiogram
- CT cardiac calcium score
- Select interventional radiology procedures
Programs and centers[4][9][10][11]
- Elevate Wellness (lifestyle medicine)
- Rapid Care same-day and next-day appointments
- Official Medical Provider for the U.S. Ski and Snowboard Teams (orthopedic surgery and rehabilitation)
- Interpreter services
Visiting and practical information
| Interpreters and languages | Free in-person and phone interpreters (Spanish on staff); Language Line for 200+ other languages, 24/7[11] |
|---|---|
| Patient portal | Patient Portal |
Recognition[5][7][10]
- Critical Access Hospital
- Press Ganey HX Guardian of Excellence Award (2025)
- American College of Radiology accreditation (Mammography, CT, MRI)
Doctors and clinicians (82)
82 doctors and other clinicians list Mammoth Hospital as a hospital where they work, in Medicare's official clinician data (updated 2026-10-02). It is not a complete staff list.
Main specialties
- Physician Assistant11
- Emergency Medicine9
- Internal Medicine8
- Orthopedic Surgery8
- Anesthesiology7
- Nurse Practitioner5
- Diagnostic Radiology5
- General Surgery4
- Family Practice4
- Obstetrics/Gynecology3
- Certified Registered Nurse Anesthetist (CRNA)3
- Neurology2
Doctors with a page on this site (82)
- Alar Saaremets, MDAnesthesiology
- Andre M. Burnier, MDEmergency Medicine
- Anne Wakamiya, MDInternal Medicine
- Ashim Ahuja, MDNeurology
- Benjamin F. Mundell, MDGeneral Surgery
- Brian B. Gilmer, MDOrthopedic Surgery
- Brian D. Quinn, MDInterventional Radiology
- Brittaney B. Vargas, MDEmergency Medicine
- Brittania M. Cogan, PAPhysician Assistant
- Bryan S. King, MDAnesthesiology
- Cali L. Kirkham, MDEmergency Medicine
- Cara P. CrosbyPhysician Assistant
- Caryn K. Slack, MDFamily Practice
- Casey MichelRegistered Dietitian or Nutrition Professional
- Chelsea BrownPhysician Assistant
- Christian D. Schwartz, PAPhysician Assistant
- Christine M. Macdonald, PAPhysician Assistant
- Christopher W. Ward, DOEmergency Medicine
- Clayton Davis, DOUrology
- Connor J. Telles, MDOrthopedic Surgery
- Cory J. Toomasian, MDEmergency Medicine
- Craig M. Burrows, MDInternal Medicine
- Daniel Fuller, CNACertified Registered Nurse Anesthetist (CRNA)
- Daniel Harrison, MDInternal Medicine
And 58 more: the button below opens the full list.
Names link to the doctor’s page on this site when there is one, otherwise to the official NPI Registry record (U.S. Department of Health and Human Services). Find a doctor · Source: CMS Facility Affiliation Data
Other emergency rooms nearby
Hospitals that list emergency services, by straight-line distance (not driving distance).
- Northern Inyo Hospital36 mi · Bishop, CA · Critical Access Hospital
- John C Fremont Healthcare District56 mi · Mariposa, CA · Critical Access Hospital
- Mount Grant General Hospital63 mi · Hawthorne, NV · Critical Access Hospital
- Clovis Community Medical Center69 mi · Clovis, CA · Acute Care Hospital
- Valley Children's Hospital70 mi · Madera, CA · Children's Hospital
Find the closest emergency room to where you are → · Compare ER wait times
Other hospitals near Mammoth Lakes
- River Vista Behavioral Health70 mi · Madera, CA · Psychiatric Hospital
Community care nearby
Health centers, clinics, urgent care and pharmacies closest to this hospital, by straight-line distance, from official HRSA, Medicare and NPI Registry data. In a medical emergency, call 911.
Clinics and urgent care
- Mammoth Hospital9.5 mi · Mammoth Lakes, CA · Rural health clinic
About the Medicare star rating
CMS (the federal Medicare agency) gives many hospitals an overall rating from 1 to 5 stars, based on measures of mortality, safety, readmissions, patient experience and timely care. It is one piece of information: ask your doctor what matters for your care. See the full Medicare profile →
Medicare quality data
What Mammoth Hospital reported to Medicare (CMS), the federal agency that publishes these results for hospitals nationwide. These are averages for many patients, not a prediction for any one person: ask your doctor what matters for your care. In a medical emergency, call 911.
What patients said (patient survey)
What this means: Patients who stayed overnight answered a national survey (HCAHPS) about their stay. More stars mean patients reported a better experience than at other hospitals. The percentages show how often patients gave the best answer, next to the national average.
| Summary star rating (all survey topics) | 5 of 5 stars |
|---|---|
| Overall rating of the hospital | 5 of 5 stars |
| Would recommend the hospital | 5 of 5 stars |
| Nurses communicated well | 5 of 5 stars |
| Doctors communicated well | 5 of 5 stars |
| Patients got help quickly from staff | 5 of 5 stars |
| Staff explained medicines | 5 of 5 stars |
| Information about recovery at home | 4 of 5 stars |
| Room and bathroom kept clean | 4 of 5 stars |
| Restfulness of Environment | 5 of 5 stars |
| Care Coordination | 5 of 5 stars |
| Symptoms After Stay | 5 of 5 stars |
| Rated the hospital 9 or 10 out of 10 | 83%National average: 72% |
| Would definitely recommend the hospital | 88%National average: 71% |
| Nurses “always” communicated well | 90%National average: 80% |
| Doctors “always” communicated well | 89%National average: 80% |
| “Always” got help as soon as they wanted | 82%National average: 64% |
| Staff “always” explained medicines before giving them | 79%National average: 62% |
| Were given information about recovery at home | 93%National average: 86% |
| Room and bathroom “always” clean | 69%National average: 73% |
| Completed surveys | 102Response rate: 26% |
Source: Patient survey (HCAHPS) - Hospital — CMS, released October 19, 2026; patients discharged January 2025 to December 2025.
Return visits to the hospital (readmissions)
What this means: The share of patients who had to be admitted to a hospital again within 30 days after going home, adjusted for how sick they were. A lower percentage is better.
| Returned to any hospital within 30 days (all patients) | 16.1% |
|---|---|
| Not reported to Medicare | Readmitted within 30 days: heart attack; Readmitted within 30 days: coronary bypass surgery |
| Too few cases to report | Readmitted within 30 days: heart failure; Readmitted within 30 days: pneumonia; Readmitted within 30 days: COPD; Readmitted within 30 days: hip or knee replacement |
Source: Unplanned Hospital Visits - Hospital — CMS, released October 20, 2026; data from July 2024 to June 2025.
Emergency room times and sepsis care
What this means: ER time is the middle (median) time from arriving at the emergency room to leaving it; busier ERs usually have longer times, so the ER volume is shown too. Leaving before being seen: a lower percentage is better. Sepsis is a life-threatening reaction to an infection; a higher percentage means more patients got every recommended early step.
| Average (median) time patients spent in the emergency room before leaving (OP-18b) | 115 minutesNational average: 162 minutes |
|---|---|
| Not reported to Medicare | Patients who left the emergency room before being seen (OP-22) |
| Too few cases to report | Sepsis patients who got all the recommended early care (SEP-1) |
Source: Timely and Effective Care - Hospital — CMS, released October 19, 2026; data from January 2025 to December 2025.
Not reported to Medicare: infections caught in the hospital, complications and deaths. For these topics Medicare shows no result for this hospital (not reported, or too few cases).
ER wait times and Medicare ratings nearby
How this hospital compares with others in the area, ranked only by official Medicare (CMS) numbers.
Prices
We have not been able to read a price file for Mammoth Hospital yet. Every US hospital must publish its standard charges online (federal price transparency rule): look for “price transparency” or “standard charges” on the hospital’s website, or call the hospital and ask for an estimate. In a medical emergency, call 911.
Hospital information
| Hospital type | Critical Access Hospital |
|---|---|
| Address | 85 Sierra Park Road PO Box 660, Mammoth Lakes, CA 93546 |
| County | Mono County |
| State | California |
| Phone | (760) 934‑3311 |
| Emergency services | Yes |
| Ownership | Government - Hospital District or Authority |
| Medicare overall rating | Not rated by CMS |
| CMS Certification Number | 051303 |
| Name in Medicare records | MAMMOTH HOSPITAL |
| Profile level | Medicare data + hospital website |
| Official website | mammothhospital.com |
| Corrections | Report an error or suggest an update → |
Sources
- Hospital General Information — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-26, retrieved 2026-11-13
- Medicare Care Compare — official Medicare profile of this hospital
- U.S. Census Bureau Geocoder — map position used for distances
From the hospital’s website
Numbers match the citations above. Checked 2026-11-02.
- Mammoth Hospital | Healthcare Services in the Eastern Sierra — mammothhospital.com
- Emergency Services | Mammoth Lakes, CA | Mammoth Hospital — mammothhospital.com
- Orthopedics | Mammoth Lakes & Bishop, CA | Mammoth Hospital — mammothhospital.com
- Medical Imaging | Mammoth Lakes, CA | Mammoth Hospital — mammothhospital.com
- General Surgery | Mammoth Lakes, CA | Mammoth Hospital — mammothhospital.com
- Healthcare Services | Mammoth Hospital — mammothhospital.com
- About Mammoth Hospital | Healthcare in the Eastern Sierra — mammothhospital.com
- Interpreter Services & Language Assistance | Mammoth Hospital — mammothhospital.com