Ramona Master, MD
Internal Medicine Physician · La Jolla, CA
Ramona Master, MD is an internal medicine physician with a practice address in La Jolla, California, and NPI 1851429617, issued on Mar 1, 2007. Check the license (California A55108, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ramona Master
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A55108 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4180 LA Jolla Village Dr Ste 220, La Jolla, CA 92037
- Phone
- (858) 321-2150
- Enumerated
- Mar 1, 2007
- Record last updated
- Jun 4, 2024
- Fax
- (858) 321-2153
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4180 LA Jolla Village Dr Ste 220
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Harry Albers, M.D.Internal Medicine Physician1174564629
Verify Ramona Master in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A55108Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average internal medicine physician in 2024
733 Medicare Part D claims for 50 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium64 claims
- Losartan Potassium31 claims
- Amlodipine Besylate22 claims
- Trazodone Hcl21 claims
- Gabapentin20 claims
- Metoprolol Succinate19 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.
Industry payments in 2024: $290.49
8 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Ramona Master among 17,696 internal medicine physician records in California
Ramona Master, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2024 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
158 internal medicine physician records list a practice address in La Jolla
They are 158 of the 3,648 NPPES records with a practice address in La Jolla, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in La Jolla → Internal Medicine Physician nationwide →
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Common questions
What is Ramona Master, MD's NPI number?
Ramona Master, MD's National Provider Identifier (NPI) is 1851429617, issued on Mar 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ramona Master, MD located?
The NPPES record lists a practice address at 4180 LA Jolla Village Dr Ste 220, La Jolla, CA, 92037. Phone: (858) 321-2150. Providers update this record themselves, so call before visiting.
How can I verify Ramona Master, MD's license?
NPPES lists California license number A55108, 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 Ramona Master, MD prescribe under Medicare Part D?
In 2024, Ramona Master, MD had 733 Medicare Part D claims for 50 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.