Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ronald Grenko, MD

Anatomic Pathology & Clinical Pathology Physician in Lancaster, PA · enumerated 2006.

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

National Provider Identifier

1861454571

Verified

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Registry record

Entity type Individual (Type 1)

Name Ronald Grenko

Credential MD

Sex Male

Practice address 555 N Duke St, Lancaster, PA, 17602

Phone (717) 544-5511

Enumeration date Apr 6, 2006

Last updated in NPPES Mar 30, 2011

Taxonomy & licenses

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License MD048891L (PA) 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
000000187809	Other	PA	UNISON
1512074	Other	PA	GATEWAY
50060185	Other	PA	CAPITAL BLUE CROSS AND KEYSTONE HEALTH PLAN CENTRAL
1527859	Other	PA	AETNA HMO
20050765	Other	PA	AMERIHEALTH MERCY
000416656	Other	PA	HIGHMARK BLUE SHIELD
001394250 0008	Medicaid	PA	-
0206056000	Other	PA	INDEPENDENCE BLUE CROSS
21676	Other	PA	GEISINGER HEALTH PLAN
4299878	Other	PA	AETNA NON-HMO
P00351049	Other	PA	RR MEDICARE

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 1861454571 active?

Yes, as of the latest NPPES snapshot, NPI 1861454571 is active (record last updated 2011-03-30).

How do I verify Ronald Grenko's NPI record?

Cross-check NPI 1861454571 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 2011-03-30.