MR. CLAN HYOKU HAHN (M.D.) – Hematology & Oncology Physician, NPI 1023043189
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,531 HEMATOLOGY/ONCOLOGY in CA
Provider Addresses for MR. CLAN HYOKU HAHN (M.D.)
520 S VIRGIL AVE STE 306
LOS ANGELES, CA 900201441
Phone: (213) 277-1700
Fax: (213) 277-1817
Type: Mailing
500, South Virgil Avenue, Westlake, Los Angeles, Los Angeles County, California, 90020, United States
SUITE 502
LOS ANGELES, CA 900201446
Phone: (213) 484-6600
Fax: (213) 484-2011
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 257 Open Payments records for all available years, with a total value of $6,551.
Total Amount is formed as General ($6,551) + Research ($0) + Ownership ($0) = $6,551.
Last reported payment date: 2024-12-24 • Largest payer in this snapshot: E.R. Squibb & Sons, L.L.C. ($918).
Total Amount
$6,551
General + Research + Ownership
Payments
257
Total payment records
General Amount
$6,551
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-24
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| E.R. Squibb & Sons, L.L.C. | $918 |
| PFIZER INC. | $564 |
| Merck Sharp & Dohme LLC | $554 |
| Regeneron Healthcare Solutions, Inc. | $404 |
| Secura Bio, Inc. | $286 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-02-01
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100201000648 | I | Hematology/Oncology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 1,054 | 190 | $0 |
| J1100 | Injection, dexamethasone sodium phosphate, 1 mg | 1,000 | 15 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 785 | 95 | $0 |
| J1626 | Injection, granisetron hydrochloride, 100 mcg | 700 | 13 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 677 | 172 | $0 |
Insurance plans in this area (ZIP 90020)
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