Mammoth Hospital in Mammoth Lakes, CA
In a medical emergency, call 911. This page is for information only.
About Mammoth Hospital
Mammoth Hospital is a critical access hospital in Mammoth Lakes, Mono County, California. It reports its ownership to Medicare as public (hospital district or authority). It provides emergency services. It does not currently have a CMS Overall Star Rating, which usually means it reports too few measures to be rated. It has 17 licensed beds, according to state license data via HIFLD.
Quality ratings
How this hospital compares with the national rate on each measure group:
Source: Centers for Medicare & Medicaid Services, Hospital General Information. How star ratings work.
Emergency room times
Lower times are better. Reporting period ending September 2025. Source: CMS Timely and Effective Care. What these numbers mean.
What patients say
- Would definitely recommend87%
- Rated the hospital 9 or 1084%
- Completed surveys94
Survey period ending September 2025. Source: CMS HCAHPS Patient Survey.
Map
37.64593, -118.96384
Frequently asked questions
Where is Mammoth Hospital located?
Mammoth Hospital is at 85 Sierra Park Road PO Box 660, Mammoth Lakes, CA 93546 in Mono County.
Does Mammoth Hospital have an emergency room?
Yes. Mammoth Hospital reports emergency services to Medicare, and patients spent a median of 117 minutes in its emergency department before leaving. In a life-threatening emergency, call 911.
What is the CMS star rating of Mammoth Hospital?
Mammoth Hospital does not have a current CMS Overall Star Rating. CMS only rates hospitals that report enough measures; critical access, psychiatric, VA and many small hospitals are often unrated, which says nothing about their quality.
Is Mammoth Hospital a trauma center?
We have no trauma center designation on record for Mammoth Hospital. Hospitals without one still treat injuries in their emergency department and transfer patients who need a trauma center. Check the California trauma program for the current list.
What is the phone number of Mammoth Hospital?
The main phone number on record with Medicare is (760) 934-3311.
Would patients recommend Mammoth Hospital?
In the most recent HCAHPS patient survey (94 completed surveys), 87% of patients said they would definitely recommend the hospital, and 84% rated it 9 or 10 out of 10.
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