Richard Chen, MD
NPI 1285602573 · Family Medicine Physician · Petaluma, CA
Richard Chen, MD is a Family Medicine Physician provider in Petaluma, CA (NPI 1285602573).
Provider details
- NPI number
- 1285602573
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
- Naturopath175F00000X
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Acetaminophen With Codeinebrand: Acetaminophen-Codeine | 15 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 13 |
| Clonazepam | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 435 Petaluma Ave Ste 150Sebastopol, CA 95472Phone: (707) 861-7300Fax: (707) 823-8568
- 395 Pleasant StNorthampton, MA 01060-3914Phone: (413) 584-7787Fax: (413) 584-7778
Registry dates
- Enumerated
- 2006-03-10
- Last updated
- 2021-02-17
- Certified
- 2021-02-17
Frequently asked questions
- What is Richard Chen's NPI number?
- Richard Chen's National Provider Identifier (NPI) is 1285602573, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Richard Chen's specialty?
- Richard Chen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Richard Chen located?
- Richard Chen's practice location on file with NPPES is 801 Marble Way, Petaluma, CA 94954-8594.
- What is Richard Chen's phone number?
- The practice phone number listed in the NPPES registry for Richard Chen is (707) 636-4363.
- Is Richard Chen's NPI active?
- Yes — Richard Chen's NPI (1285602573) is active in the NPPES registry as of the last update on 2021-02-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.