James Maas, M.D. PH.D.
NPI 1255506788 · Neurology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Maas, M.D. PH.D. is a Neurology Physician provider in San Francisco, CA (NPI 1255506788).
Provider details
- NPI number
- 1255506788
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D. PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A102712 (CA)
Specialties & taxonomies
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
326 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 142 | $162 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 65 | $19 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 49 | $109 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 49 | $35 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 231 | 63 |
| Carbidopa/Levodopabrand: Rytary | 148 | 16 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa Er | 135 | 35 |
| Clonazepam | 46 | — |
| Donepezil Hcl | 45 | 19 |
| Amantadine Hclbrand: Amantadine | 40 | 12 |
| Entacapone | 35 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-04-25
- Last updated
- 2008-04-25
Frequently asked questions
- What is James Maas's NPI number?
- James Maas's National Provider Identifier (NPI) is 1255506788, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Maas's specialty?
- James Maas is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is James Maas located?
- James Maas's practice location on file with NPPES is 505 Parnassus Avenue, San Francisco, CA 94143-0114.
- What is James Maas's phone number?
- The practice phone number listed in the NPPES registry for James Maas is (415) 476-1489.
- Does James Maas accept Medicare?
- James Maas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Maas's NPI active?
- Yes — James Maas's NPI (1255506788) is active in the NPPES registry as of the last update on 2008-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.