NPPES file of Aug 9, 2026

Guinea Singh Fan, M.D.

Gastroenterology Physician · Sacramento, CA

Guinea Singh Fan, M.D. is a gastroenterology physician with a practice address in Sacramento, California, and NPI 1356504716, issued on Jul 7, 2008. Check the license (California A106539, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1356504716
Name
Guinea Singh Fan
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
A106539 CA
Self-reported in NPPES; status is on the state search
Practice location
4150 V St Ste 3500, Sacramento, CA 95817
Phone
(916) 734-7224
Enumerated
Jul 7, 2008
Record last updated
Feb 26, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20130801000465); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →

Also registered at 4150 V St Ste 3500

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Maryam Afkarian, M.D., PH.D.Nephrology Physician1255387338
  2. Maria AguilarGastroenterology Physician1265701494
  3. Natalie Beck, MDNephrology Physician1881082519
  4. Nicole Bernstein, MDGastroenterology Physician1982280541
  5. Andrea Broka, MDInternal Medicine Physician1578028189
  6. Jacqueline Chang, MDGastroenterology Physician1437785458

Verify Guinea Singh Fan in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A106539    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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69% fewer Medicare Part D claims than the average gastroenterology physician in 2024

249 Medicare Part D claims for 165 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.

  1. Guinea Fan249
  2. Specialty average811

Most prescribed

  1. Gavilyte-G43 claims
  2. Pantoprazole Sodium41 claims
  3. Sod Sulf-Potass Sulf-Mag Sulf33 claims
  4. Peg-3350 And Electrolytes29 claims
  5. Omeprazole21 claims
  6. Gavilyte-C16 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: $112.12

1 payment: food and beverage; the largest payer was Genzyme Corporation. 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.

  1. Guinea Fan$112.12
  2. Specialty average$5,015.95

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

  1. Regents OF The University OF CaliforniaFolsom, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Guinea Singh Fan among 2,140 gastroenterology physician records in California

Guinea Singh Fan, M.D. 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 2008, is newer than 63% of them.

  • NPI issued2008 · 63% of these records are older, 31% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 72% of these records are
  • Graduated2004 · median 2002 among the 1,538 with a school on file
  • Record last updated2020 · 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 Sacramento → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Amar Al-Juburi, M.D.Sacramento, CA 958171821041229
  2. Christopher Aoki, M.D.Sacramento, CA 958171164460499
  3. Christopher Bowlus, M.D.Sacramento, CA 958171942252085
  4. Juan Garcia, M.D.Sacramento, CA 958171407809288
  5. Michael Lawson, MDSacramento, CA 958171245318922
  6. Joseph Leung, M.D.Sacramento, CA 958171861475287
  7. Valentina Medici, M.D.Sacramento, CA 958171902858541
  8. Mary Pauly, MDSacramento, CA 958171225116999

Common questions

What is Guinea Singh Fan, M.D.'s NPI number?

Guinea Singh Fan, M.D.'s National Provider Identifier (NPI) is 1356504716, issued on Jul 7, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Guinea Singh Fan, M.D. located?

The NPPES record lists a practice address at 4150 V St Ste 3500, Sacramento, CA, 95817. Phone: (916) 734-7224. Providers update this record themselves, so call before visiting.

How can I verify Guinea Singh Fan, M.D.'s license?

NPPES lists California license number A106539, 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 Guinea Singh Fan, M.D. prescribe under Medicare Part D?

In 2024, Guinea Singh Fan, M.D. had 249 Medicare Part D claims for 165 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.