Diane Tjornhom, MD
NPI 1649339235 · Rheumatology Physician · Bellflower, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Tjornhom, MD is a Rheumatology Physician provider in Bellflower, CA (NPI 1649339235).
Provider details
- NPI number
- 1649339235
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G73827 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 290 | 97 |
| Hydroxychloroquine Sulfate | 233 | 94 |
| Meloxicam | 122 | 54 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 120 | 25 |
| Prednisone | 106 | 50 |
| Allopurinol | 89 | 34 |
| Leflunomide | 69 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2021-11-29
Frequently asked questions
- What is Diane Tjornhom's NPI number?
- Diane Tjornhom's National Provider Identifier (NPI) is 1649339235, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Tjornhom's specialty?
- Diane Tjornhom is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Diane Tjornhom located?
- Diane Tjornhom's practice location on file with NPPES is 9400 Rosecrans Ave, Bellflower, CA 90706-2246.
- What is Diane Tjornhom's phone number?
- The practice phone number listed in the NPPES registry for Diane Tjornhom is (562) 461-3000.
- Does Diane Tjornhom accept Medicare?
- Diane Tjornhom is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Tjornhom's NPI active?
- Yes — Diane Tjornhom's NPI (1649339235) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.