DR. THOMAS MARTIN HEMMEN (M.D./PH.D) – Vascular Neurology Physician, NPI 1902821945
Vascular Neurology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
87 NEUROPSYCHIATRY in CA
Provider Addresses for DR. THOMAS MARTIN HEMMEN (M.D./PH.D)
PO BOX 232410
SAN DIEGO, CA 921932410
Phone:
Type: Mailing
6655 Alvarado Rd
San Diego, CA 921205208
Phone: (800) 926-8273
Fax: (888) 539-8781
Type: Location
9350 Campus Point Dr
LA Jolla, CA 920371300
Phone: (800) 926-8273
Fax: (888) 539-8781
Type: Location
FILE 57326
LOS ANGELES, CA 900747326
Phone: (858) 249-6748
Type: Mailing
UC San Diego Medical Center, 200, West Arbor Drive, Hillcrest, San Diego, San Diego County, California, 92103, United States
SAN DIEGO, CA 921039000
Phone: (800) 926-8273
Fax: (888) 539-8781
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $3,183.
Total Amount is formed as General ($33) + Research ($3,150) + Ownership ($0) = $3,183.
Last reported payment date: 2024-05-16 • Largest payer in this snapshot: ZOLL Circulation Inc ($3,150).
Total Amount
$3,183
General + Research + Ownership
Payments
4
Total payment records
General Amount
$33
General payments
Research Amount
$3,150
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-16
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ZOLL Circulation Inc | $3,150 |
| Genentech USA, Inc. | $33 |
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: 2004-08-24
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 |
|---|---|---|---|---|
| I20040824000829 | I | Neuropsychiatry | 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 |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 117 | 62 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 74 | 72 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 19 | 19 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 14 | 13 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 13 | 13 | $0 |
Insurance plans in this area (ZIP 92193)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CA | |
| - | CA | |
| - | CA | |
| Surgical Oncology, General Surgery | MI | |
| - | CA | |
| - | CA | |
| - | CA | |
| Physician Assistant | CA | |
| - | CA | |
| Emergency Medicine, Medical Toxicology | CA |
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