NPI age
12 years
Enumerated 2014-04-10
● Active
Type 1 · Individual
DR. Jason Willis, M.D., PH.D.
Willis is 1 of 221 internal medicine providers in Houston and 1 of 576 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2022-02-11
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 576 active internal medicine providers in Texas.
NPI age
12 years
↓ 7 yr below median (19 yr)
State licenses
1 state
18% of peers hold multiple states
Subspecialties
0
46% of peers hold subspecialties
NPI lifetime · 2014 → 2026
2014-04Enumerated in NPPES
2014
2026
Where they practice
Practice location
1515 Holcombe Blvd
Houston, TX 770304000
Mailing address
Po Box 4439
Houston, TX 772104439
Specialties
-
Internal Medicine PrimaryAn internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 387864701 | |
| 01 (TX) | 387864702 | MEDICAID CSHCN |
Practice context
Part of a multi-provider practice. 3675 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in Houston in the last 180 days.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.