Michael Ma, MD
NPI 1891945804 · Internal Medicine Physician · San Gabriel, CA
Enrolled with Medicare as Practitioner - Hospice/Palliative Care · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Ma, MD is a Internal Medicine Physician provider in San Gabriel, CA (NPI 1891945804).
Provider details
- NPI number
- 1891945804
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A107326 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 195 | 68 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 104 | 40 |
| Morphine Sulfatebrand: Morphine Sulfate Er | 70 | 26 |
| Lactulose | 69 | 41 |
| Gabapentin | 65 | 32 |
| Prednisone | 62 | 36 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-09-26
- Last updated
- 2021-11-30
Frequently asked questions
- What is Michael Ma's NPI number?
- Michael Ma's National Provider Identifier (NPI) is 1891945804, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Ma's specialty?
- Michael Ma is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Ma located?
- Michael Ma's practice location on file with NPPES is 933 Walnut St, San Gabriel, CA 91776-2836.
- What is Michael Ma's phone number?
- The practice phone number listed in the NPPES registry for Michael Ma is (626) 372-5922.
- Does Michael Ma accept Medicare?
- Michael Ma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Ma's NPI active?
- Yes — Michael Ma's NPI (1891945804) is active in the NPPES registry as of the last update on 2021-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.