Clan Hahn, M.D.
NPI 1023043189 · Hematology & Oncology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clan Hahn, M.D. is a Hematology & Oncology Physician provider in Los Angeles, CA (NPI 1023043189).
Provider details
- NPI number
- 1023043189
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G78245 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,685 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 745 | $138 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 737 | $122 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 496 | $9 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 179 | $17 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 132 | $179 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 126 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 51 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 94 | 24 |
| Ondansetronbrand: Ondansetron Odt | 86 | 52 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 57 | 25 |
| Epoetin Alfabrand: Procrit | 52 | 12 |
| Dexamethasone | 50 | 19 |
| Diphenhydramine Hcl | 47 | 12 |
| Dexamethasone Sodium Phosphate | 45 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,216 across 165 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2022-07-12
- Certified
- 2022-07-12
Frequently asked questions
- What is Clan Hahn's NPI number?
- Clan Hahn's National Provider Identifier (NPI) is 1023043189, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clan Hahn's specialty?
- Clan Hahn is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Clan Hahn located?
- Clan Hahn's practice location on file with NPPES is 520 S Virgil Ave Ste 306, Los Angeles, CA 90020-1441.
- What is Clan Hahn's phone number?
- The practice phone number listed in the NPPES registry for Clan Hahn is (213) 277-1700.
- Does Clan Hahn accept Medicare?
- Clan Hahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clan Hahn's NPI active?
- Yes — Clan Hahn's NPI (1023043189) is active in the NPPES registry as of the last update on 2022-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.