Ralph L. Peterson, MD
Gastroenterology Physician · Oakland, CA
Ralph L. Peterson, MD is a gastroenterology physician with a practice address in Oakland, California, and NPI 1851311104, issued on Jul 20, 2006. Check the license (California G49099, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph L. Peterson
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G49099 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10520 Macarthur Blvd, Oakland, CA 94605
- Phone
- (510) 562-7467
- Enumerated
- Jul 20, 2006
- Record last updated
- Dec 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (510) 635-9025
- Medicaid ID
- 00G490990 CA
- Medicare enrollment
- Enrolled (PECOS I20091212000124); accepts Medicare assignment
- Medical or professional school
- Howard University College Of Medicine, 1978
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 10520 Macarthur Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Holly Hopkins, NPFamily Nurse Practitioner1639796600
Verify Ralph L. Peterson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G49099Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average gastroenterology physician in 2024
1,396 Medicare Part D claims for 235 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Famotidine296 claims
- Dicyclomine Hcl191 claims
- Pantoprazole Sodium131 claims
- Linzess108 claims
- Omeprazole90 claims
- Dexlansoprazole Dr70 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.
The MIPS final score for 2023 (Medicare payment program): 30 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $10,243.60
32 payments; by number, the most common kind was food and beverage; the largest payer was Gilead Sciences, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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.
Bills Medicare through one group practice
- Equity HealthSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ralph L. Peterson among 2,140 gastroenterology physician records in California
Ralph L. Peterson, MD is one of 2,140 gastroenterology physician records with a practice address in California. 83% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1978 · median 2002 among the 1,538 with a school on file
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Oakland → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Eddie Cheung, MDOakland, CA 946071255305447
- Laura Pace, M.D., PH.D.Oakland, CA 946071104142025
- Ronald Adler, MDOakland, CA 946021134206162
- John Roark, MDOakland, CA 946021609834266
- Ayesha Zahiruddin, MDOakland, CA 946021942598396
- Kimberly Cusato, MDOakland, CA 946111487733531
- Keith Fiman, M.D.Piedmont, CA 946111578564506
- Lawrence Ku, MDOakland, CA 946111912439266
Common questions
What is Ralph L. Peterson, MD's NPI number?
Ralph L. Peterson, MD's National Provider Identifier (NPI) is 1851311104, issued on Jul 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph L. Peterson, MD located?
The NPPES record lists a practice address at 10520 Macarthur Blvd, Oakland, CA, 94605. Phone: (510) 562-7467. Providers update this record themselves, so call before visiting.
How can I verify Ralph L. Peterson, MD's license?
NPPES lists California license number G49099, 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 Ralph L. Peterson, MD prescribe under Medicare Part D?
In 2024, Ralph L. Peterson, MD had 1,396 Medicare Part D claims for 235 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Ralph L. Peterson, MD's MIPS final score?
The 2023 MIPS final score is 30 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.