Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Denise G Aldahl, MD

Obstetrics & Gynecology Physician in Sierra Madre, CA · enumerated 2007 · practices at Sierra Madre Community Medical Group, Inc.

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

National Provider Identifier

1174746804

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Registry record

Entity type Individual (Type 1)

Name Denise G Aldahl

Credential MD

Sex Female

Practice address 147 W Sierra Madre Blvd, Sierra Madre, CA, 91024

Phone (626) 355-3443

Fax (626) 355-7843

Enumeration date Apr 11, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License G73120 (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
ZZZ60648Z	Other	CA	BLUE SHIELD

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 is the NPI number for Denise Aldahl?

The National Provider Identifier (NPI) for Denise Aldahl is 1174746804, a Type 1 (individual) record in the CMS NPPES registry.

Where does Denise Aldahl practice?

The practice location on file with NPPES is in Sierra Madre, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.