Joseph Chun, D.O.
NPI 1780678789 · Physical Medicine & Rehabilitation Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Physical Medicine and Rehabilitation · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chun, D.O. is a Physical Medicine & Rehabilitation Physician provider in Oakland, CA (NPI 1780678789).
Provider details
- NPI number
- 1780678789
- Entity type
- Individual
- Primary specialty
- Physical Medicine & Rehabilitation PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A20260 (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 tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 58 | 41 |
| Baclofen | 40 | 24 |
| Methylprednisolone | 39 | 33 |
| Lorazepam | 22 | 19 |
| Nabumetone | 13 | — |
| Pregabalin | 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 , 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
Registry dates
- Enumerated
- 2005-09-06
- Last updated
- 2024-03-22
- Certified
- 2024-03-22
Frequently asked questions
- What is Joseph Chun's NPI number?
- Joseph Chun's National Provider Identifier (NPI) is 1780678789, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chun's specialty?
- Joseph Chun is listed in the NPPES registry with a primary specialty of Physical Medicine & Rehabilitation Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chun located?
- Joseph Chun's practice location on file with NPPES is 275 W Macarthur Blvd, Oakland, CA 94611-5641.
- What is Joseph Chun's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chun is (510) 752-1000.
- Does Joseph Chun accept Medicare?
- Joseph Chun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chun's NPI active?
- Yes — Joseph Chun's NPI (1780678789) is active in the NPPES registry as of the last update on 2024-03-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.