Gene Nakajima, MD
NPI 1669596482 · Psychiatry Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gene Nakajima, MD is a Psychiatry Physician provider in San Francisco, CA (NPI 1669596482).
Provider details
- NPI number
- 1669596482
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A52002 (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
19 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
167 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 80 | $75 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 53 | $40 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 18 | $101 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 16 | $40 |
Typical Medicare-allowed amounts for these services range $40–$101 (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 |
|---|---|---|
| Sertraline Hcl | 220 | 22 |
| Bupropion Hclbrand: Bupropion Xl | 124 | 12 |
| Risperidone | 115 | — |
| Aripiprazole | 87 | — |
| Olanzapine | 81 | — |
| Divalproex Sodium | 61 | — |
| Duloxetine Hcl | 47 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-19
- Last updated
- 2009-12-11
Frequently asked questions
- What is Gene Nakajima's NPI number?
- Gene Nakajima's National Provider Identifier (NPI) is 1669596482, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gene Nakajima's specialty?
- Gene Nakajima is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Gene Nakajima located?
- Gene Nakajima's practice location on file with NPPES is 1701 Ocean Ave, San Francisco, CA 94112-1727.
- What is Gene Nakajima's phone number?
- The practice phone number listed in the NPPES registry for Gene Nakajima is (415) 452-2200.
- Does Gene Nakajima accept Medicare?
- Gene Nakajima is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gene Nakajima's NPI active?
- Yes — Gene Nakajima's NPI (1669596482) is active in the NPPES registry as of the last update on 2009-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.