Jee Hoon Jang, MD
NPI 1639691579 · Internal Medicine Physician · Simi Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jee Hoon Jang, MD is a Internal Medicine Physician provider in Simi Valley, CA (NPI 1639691579).
Provider details
- NPI number
- 1639691579
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A173800 (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
9 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 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 540 | 169 |
| Amlodipine Besylate | 299 | 93 |
| Metformin Hcl | 284 | 96 |
| Losartan Potassium | 193 | 67 |
| Tamsulosin Hcl | 170 | 58 |
| Omeprazole | 160 | 68 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-07-12
- Last updated
- 2026-01-08
- Certified
- 2026-01-08
Frequently asked questions
- What is Jee Hoon Jang's NPI number?
- Jee Hoon Jang's National Provider Identifier (NPI) is 1639691579, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jee Hoon Jang's specialty?
- Jee Hoon Jang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jee Hoon Jang located?
- Jee Hoon Jang's practice location on file with NPPES is 1424 Madera Rd, Simi Valley, CA 93065-3053.
- What is Jee Hoon Jang's phone number?
- The practice phone number listed in the NPPES registry for Jee Hoon Jang is (805) 522-5722.
- Does Jee Hoon Jang accept Medicare?
- Jee Hoon Jang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jee Hoon Jang's NPI active?
- Yes — Jee Hoon Jang's NPI (1639691579) is active in the NPPES registry as of the last update on 2026-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.