Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Catherine S Mao, M.D.

Pediatric Endocrinology Physician in Torrance, CA · enumerated 2006 · practices at Prohealth Partners A Medical Group.

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

National Provider Identifier

1073567236

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Registry record

Entity type Individual (Type 1)

Name Catherine S Mao

Credential M.D.

Sex Female

Practice address 21840 Normandie Ave, Ste. 1100, Torrance, CA, 90502

Phone (310) 222-5133

Fax (310) 781-9352

Enumeration date May 20, 2006

Last updated in NPPES Jul 23, 2019

Taxonomy & licenses

2080P0205X Pediatric Endocrinology Physician Allopathic & Osteopathic Physicians · License A51970 (CA) Primary

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

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 Catherine Mao?

Catherine Mao is registered in NPPES with the primary taxonomy of Pediatric Endocrinology 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 2019-07-23.