NPI age
19 years
Enumerated 2006-06-06
● Active
Type 1 · Individual
Hassan M Alissa, MD
Alissa is 1 of 5 internal medicine providers in San Marcos and 1 of 749 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
MO, TX
2 states
Status
Active
No deactivations on record
Last NPPES update
2014-02-14
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 749 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (18 yr)
State licenses
2 states
Top 85% — 15% of peers are multi-state
Subspecialties
0
34% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-06Enumerated in NPPES
2006
2026
Where they practice
Practice location
1340 Wonder World Dr, Bldg.2, Suite 2203
San Marcos, TX 786667598
Mailing address
1340 Wonder World Dr, Bldg.2, Suite 2203
San Marcos, TX 786667598
Specialties
-
Internal Medicine PrimaryAn internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases.
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 | 152268 | BCBS |
| 05 (MO) | 205333818 | |
| 01 | P00152821 | RAILROAD MEDICARE |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 11 other active providers share this practice address in NPPES.
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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.