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

Susan K Grenz, MD

Q: What is the NPI number for Susan Grenz?

The National Provider Identifier (NPI) for Susan Grenz is 1013989870, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Laguna Woods, CA · enumerated 2006.

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

National Provider Identifier

1013989870

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Registry record

Entity type Individual (Type 1)

Name Susan K Grenz

Credential MD

Sex Female

Practice address Laguna Woods, CA, 92637

Phone (727) 798-6640

Enumeration date Feb 6, 2006

Last updated in NPPES Dec 16, 2013

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 18697 (MT) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 12279 (ND) 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
102600	Other	-	AUMED
123062	Other	-	HUMANA
3000067	Other	-	BAYCARE
622728	Other	-	AETNA
3386236002	Other	-	CIGNA
123063	Other	-	HUMANA GOLD
62527	Other	-	BCBS
592712571	Other	-	UNITED HEALTH CARE

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 Susan Grenz?

The National Provider Identifier (NPI) for Susan Grenz is 1013989870, a Type 1 (individual) record in the CMS NPPES registry.

Where does Susan Grenz practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-12-16.