Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Charles William Maas, M.D.

Psychiatry Physician in Yuba City, CA · enumerated 2005.

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

National Provider Identifier

1609851757

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Registry record

Entity type Individual (Type 1)

Name Charles William Maas

Credential M.D.

Sex Male

Practice address 1965 Live Oak Blvd, Sutter-Yuba Mental Heath Youth Services, Yuba City, CA, 95991

Phone (530) 822-7513

Fax (530) 822-7514

Enumeration date Dec 13, 2005

Last updated in NPPES Sep 23, 2013

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License G15905 (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
00G159050	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.

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Frequently asked questions

Is NPI 1609851757 active?

Yes, as of the latest NPPES snapshot, NPI 1609851757 is active (record last updated 2013-09-23).

How do I verify Charles Maas's NPI record?

Cross-check NPI 1609851757 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-09-23.