Diane Mar, MD
NPI 1356704795 · Rheumatology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Mar, MD is a Rheumatology Physician provider in Stanford, CA (NPI 1356704795).
Provider details
- NPI number
- 1356704795
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A161922 (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
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
68 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 | 44 | $110 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 24 | $143 |
Typical Medicare-allowed amounts for these services range $110–$143 (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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 41 | 13 |
| Hydroxychloroquine Sulfate | 33 | — |
| Allopurinol | 29 | — |
| Tocilizumabbrand: Actemra Actpen | 16 | — |
| Leflunomide | 13 | — |
| Methotrexate Sodiumbrand: Methotrexate | 13 | — |
| Tramadol Hcl | 12 | — |
Practice location
Mailing address
Additional practice locations (2)
- 1000 Welch Rd Ste 203Palo Alto, CA 94304-1808Phone: (999) 999-9999
- 900 Blake Wilbur DrPalo Alto, CA 94304-2201Phone: (650) 723-6961
Registry dates
- Enumerated
- 2016-04-02
- Last updated
- 2024-04-15
- Certified
- 2024-04-15
Frequently asked questions
- What is Diane Mar's NPI number?
- Diane Mar's National Provider Identifier (NPI) is 1356704795, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Mar's specialty?
- Diane Mar is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Diane Mar located?
- Diane Mar's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Diane Mar's phone number?
- The practice phone number listed in the NPPES registry for Diane Mar is (650) 723-4000.
- Does Diane Mar accept Medicare?
- Diane Mar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Mar's NPI active?
- Yes — Diane Mar's NPI (1356704795) is active in the NPPES registry as of the last update on 2024-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.