Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John E Fassler, MD

Nephrology Physician in Rock Hill, SC · enumerated 2005 · practices at Nephrology Associates PA.

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

National Provider Identifier

1891798757

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Registry record

Entity type Individual (Type 1)

Name John E Fassler

Credential MD

Sex Male

Practice address 1436 Riverchase Blvd, Rock Hill, SC, 29732

Phone (803) 329-2636

Fax (803) 329-2184

Enumeration date May 24, 2005

Last updated in NPPES Feb 5, 2026

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 19767 (SC) 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
T38527	Medicaid	SC	-

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

Is NPI 1891798757 active?

Yes, as of the latest NPPES snapshot, NPI 1891798757 is active (record last updated 2026-02-05).

How do I verify John Fassler's NPI record?

Cross-check NPI 1891798757 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 2026-02-05.