Janet Ma, M.D.
NPI 1164698098 · Internal Medicine Physician · Santa Monica, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Ma, M.D. is a Internal Medicine Physician provider in Santa Monica, CA (NPI 1164698098).
Provider details
- NPI number
- 1164698098
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A108822 (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 tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
294 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 119 | $104 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 71 | $74 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 53 | $63 |
| Administration of Influenza Virus VaccineG0008 | 29 | $34 |
| Admn Sarscov2 Vacc 1 Dose90480 | 22 | $47 |
Typical Medicare-allowed amounts for these services range $34–$104 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 143 | 44 |
| Levothyroxine Sodium | 72 | 18 |
| Amlodipine Besylate | 64 | 23 |
| Losartan Potassium | 59 | 17 |
| Alendronate Sodium | 54 | 18 |
| Rosuvastatin Calcium | 50 | 18 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-04-30
- Last updated
- 2014-02-03
Frequently asked questions
- What is Janet Ma's NPI number?
- Janet Ma's National Provider Identifier (NPI) is 1164698098, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Ma's specialty?
- Janet Ma is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Janet Ma located?
- Janet Ma's practice location on file with NPPES is 1245 16th St, Santa Monica, CA 90404-1235.
- What is Janet Ma's phone number?
- The practice phone number listed in the NPPES registry for Janet Ma is (310) 315-8900.
- Does Janet Ma accept Medicare?
- Janet Ma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Ma's NPI active?
- Yes — Janet Ma's NPI (1164698098) is active in the NPPES registry as of the last update on 2014-02-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.