Cynthia M. Mullen, M.D.
Gastroenterology Physician · Walnut Creek, CA
Cynthia M. Mullen, M.D. is a gastroenterology physician with a practice address in Walnut Creek, California, and NPI 1013123140, issued on May 15, 2007. Check the license (California A125601, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cynthia M. Mullen
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A125601 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2637 Shadelands Dr, Walnut Creek, CA 94598
- Phone
- (925) 322-2372
- Enumerated
- May 15, 2007
- Record last updated
- Mar 3, 2025
- Fax
- (925) 322-6720
- Medicare enrollment
- Enrolled (PECOS I20150414002728); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2003
- 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 2637 Shadelands Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anita Anand, NPFamily Nurse Practitioner1023993102
- Stacyann Andaya, NPFamily Nurse Practitioner1649893660
- Audrey Arzamendi, M.D.Endocrinology, Diabetes & Metabolism Physician1508159567
- Anthony Bernens, MDInternal Medicine Physician1215983440
- Jennifer Chan, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1265634687
- Heidi Chang, MDObstetrics & Gynecology Physician1649681982
Verify Cynthia M. Mullen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A125601Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average gastroenterology physician in 2024
1,282 Medicare Part D claims for 449 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Omeprazole471 claims
- Pantoprazole Sodium412 claims
- Sod Sulf-Potass Sulf-Mag Sulf160 claims
- Esomeprazole Magnesium23 claims
- Ondansetron Odt21 claims
- Furosemide14 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): 93.1 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: $315.19
13 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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
- Bass Medical GroupAlamo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cynthia M. Mullen among 2,140 gastroenterology physician records in California
Cynthia M. Mullen, 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 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2003 · median 2002 among the 1,538 with a school on file
- Record last updated2025 · 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 Walnut Creek → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Mervyn Becker, MDWalnut Creek, CA 945981841329430
- Steve Cheng, MDWalnut Creek, CA 945981245318328
- Shireen Ghorbani, M.D.Walnut Creek, CA 945981083845598
- Varujan Keledjian, M.D.Walnut Creek, CA 945981508831678
- Henry Kung, M.D.Walnut Creek, CA 945981518941673
- Will Lane, M.D.Walnut Creek, CA 945981548244684
- David Lin, M.D.Walnut Creek, CA 945981982664041
- Drew Schembre, MDWalnut Creek, CA 945981366557217
Common questions
What is Cynthia M. Mullen, M.D.'s NPI number?
Cynthia M. Mullen, M.D.'s National Provider Identifier (NPI) is 1013123140, issued on May 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia M. Mullen, M.D. located?
The NPPES record lists a practice address at 2637 Shadelands Dr, Walnut Creek, CA, 94598. Phone: (925) 322-2372. Providers update this record themselves, so call before visiting.
How can I verify Cynthia M. Mullen, M.D.'s license?
NPPES lists California license number A125601, 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 Cynthia M. Mullen, M.D. prescribe under Medicare Part D?
In 2024, Cynthia M. Mullen, M.D. had 1,282 Medicare Part D claims for 449 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Cynthia M. Mullen, M.D.'s MIPS final score?
The 2023 MIPS final score is 93.1 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.