Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Maria Marissa De Leon Liwag, MD

Pediatrics Physician in Modesto, CA · enumerated 2007.

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

National Provider Identifier

1467500470

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Registry record

Entity type Individual (Type 1)

Name Maria Marissa De Leon Liwag

Credential MD

Sex Female

Practice address 4125 Bangs Ave, Modesto, CA, 95356

Phone (209) 551-3174

Fax (209) 557-1685

Enumeration date Jan 8, 2007

Last updated in NPPES Jan 10, 2022

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A89974 (CA) Primary

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
00A899740	Medicaid	CA	-

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

What specialty is Maria Marissa Liwag?

Maria Marissa Liwag is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-10.