Maria C. Ramirez, MD
Hospitalist Physician · Walnut Creek, CA
Maria C. Ramirez, MD is a hospitalist physician with a practice address in Walnut Creek, California, and NPI 1558449652, issued on Nov 2, 2006. Check the license (California A73370, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maria C. Ramirez
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A73370 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4000
- Enumerated
- Nov 2, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A733700 CA
- Medicare enrollment
- Enrolled (PECOS I20110211000007); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 1997
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Maria C. Ramirez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A73370Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average hospitalist physician in 2024
290 Medicare Part D claims for 101 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Amlodipine Besylate13 claims
- Cefpodoxime Proxetil12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria C. Ramirez among 3,099 hospitalist physician records in California
Maria C. Ramirez, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated1997 · median 2010 among the 2,505 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
68 hospitalist physician records list a practice address in Walnut Creek
They are 68 of the 6,170 NPPES records with a practice address in Walnut Creek, and 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Walnut Creek → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Anna Bavykina, MDWalnut Creek, CA 945961467530535
- Michael Fein, MDWalnut Creek, CA 945961942388046
- Prathibha Gubbi Ravishankar, MDWalnut Creek, CA 945961528146693
- Ravinder Gupta, MDWalnut Creek, CA 945961649358714
- Brent Levenfeld, MDWalnut Creek, CA 945961154409233
- Tsao-Yu Liang, MDWalnut Creek, CA 945961053499137
- Ramon Ortiz, MDWalnut Creek, CA 945961376621433
- Peter Rowe, M.D.Walnut Creek, CA 945961700831922
Common questions
What is Maria C. Ramirez, MD's NPI number?
Maria C. Ramirez, MD's National Provider Identifier (NPI) is 1558449652, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria C. Ramirez, MD located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4000. Providers update this record themselves, so call before visiting.
How can I verify Maria C. Ramirez, MD's license?
NPPES lists California license number A73370, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Maria C. Ramirez, MD prescribe under Medicare Part D?
In 2024, Maria C. Ramirez, MD had 290 Medicare Part D claims for 101 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.