Dennis S. Riff, M.D.
Specialist · Anaheim, CA
Dennis S. Riff, M.D. is a specialist with a practice address in Anaheim, California, and NPI 1922004662, issued on Jun 27, 2005. Check the license (California G22807, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Dennis S. Riff
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G22807 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1211 W LA Palma Ave, Anaheim, CA 92801
- Phone
- (714) 778-1300
- Enumerated
- Jun 27, 2005
- Record last updated
- Jan 14, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (714) 778-0303
- Medicaid ID
- ZZZ83646Z CA
- Medicare enrollment
- Enrolled (PECOS I20120404000715); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 1971
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 1211 W LA Palma Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- William Foley, M.D.Specialist1700856598
Verify Dennis S. Riff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G22807Check 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 specialist in 2024
2,371 Medicare Part D claims for 922 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Pantoprazole Sodium322 claims
- Omeprazole320 claims
- Sod Sulf-Potass Sulf-Mag Sulf259 claims
- Gavilyte-G108 claims
- Famotidine102 claims
- Linzess95 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): 25.4 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: $22,593.18
159 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 5,844 providers of this specialty with any payment received $4,760.79 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
- Associated Gastroenterology Medical GroupAnaheim, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dennis S. Riff among 5,749 specialist records in California
Dennis S. Riff, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1971 · median 1989 among the 1,075 with a school on file
- Record last updated2013 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Anaheim → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Piya Ballani, MDAnaheim, CA 928011649225111
- Hsing Chung, M.D.Anaheim, CA 928011891723946
- Nooshin FarahmandAnaheim, CA 928011821013293
- William Foley, M.D.Anaheim, CA 928011700856598
- Babak Kasravi, M.D.Anaheim, CA 928011194786426
- Mahaveer Khemka, M.DAnaheim, CA 928011568449965
- Kevin Kuettel, M.D.Anaheim, CA 928011740286384
- Edward Levine, M.D.Anaheim, CA 928011194705335
Common questions
What is Dennis S. Riff, M.D.'s NPI number?
Dennis S. Riff, M.D.'s National Provider Identifier (NPI) is 1922004662, issued on Jun 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Dennis S. Riff, M.D. located?
The NPPES record lists a practice address at 1211 W LA Palma Ave, Anaheim, CA, 92801. Phone: (714) 778-1300. Providers update this record themselves, so call before visiting.
How can I verify Dennis S. Riff, M.D.'s license?
NPPES lists California license number G22807, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Dennis S. Riff, M.D. prescribe under Medicare Part D?
In 2024, Dennis S. Riff, M.D. had 2,371 Medicare Part D claims for 922 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Dennis S. Riff, M.D.'s MIPS final score?
The 2023 MIPS final score is 25.4 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.