Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Hassan M Alissa, MD

Rheumatology Physician in San Marcos, TX · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1770522633

Verified

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Registry record

Entity type Individual (Type 1)

Name Hassan M Alissa

Credential MD

Sex Male

Practice address San Marcos, TX, 78666

Phone (512) 667-7123

Fax (512) 667-7328

Enumeration date Jun 6, 2006

Last updated in NPPES Feb 14, 2014

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 2000160315 (MO) Primary

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License M7820 (TX) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
152268	Other	-	BCBS
205333818	Medicaid	MO	-
P00152821	Other	-	RAILROAD MEDICARE

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Hassan Alissa practice?

The practice location on file with NPPES is in San Marcos, TX. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Hassan Alissa?

The National Provider Identifier (NPI) for Hassan Alissa is 1770522633, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-14.