Cynthia M. Mullen, M.D.
NPI 1013123140ActiveIndividual· Internal Medicine, Gastroenterology· Walnut Creek, CA
Internal Medicine, Gastroenterology (M.D.) in Walnut Creek, California, trained at Tulane University School of Medicine (class of 2003). 387 Medicare patients in 2024, $107,111 paid; nearly all of their 1,282 Part D prescriptions were generic (95%). Abbvie Inc. was the largest of 9 companies reporting payments in 2025, $683.71 in all, mostly food and beverage.
Overview
| NPI | 1013123140 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 15, 2007 |
| Last updated in NPPES | Mar 3, 2025 |
| Certified by provider | Mar 3, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A125601 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 387 |
|---|---|
| Services billed | 856 across 31 procedure codes |
| Paid by Medicare | $107,111 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,282 · 3,177 30-day fills |
|---|---|
| Patients | 449 |
| Total drug cost | $143,975 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 2003 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Bass Medical GroupChico, CA · 291 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$683.71 · 30 payments from 9 companies
- 2024$315.19 · 13 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $329.00 | 16 |
| Janssen Biotech, Inc. | $106.38 | 4 |
| Braintree Laboratories, Inc. | $53.35 | 2 |
| Aimmune Therapeutics, Inc. | $53.03 | 2 |
| Phathom Pharmaceuticals, Inc. | $49.12 | 2 |
What the 2025 payments were for
- Food and Beverage$683.71 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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