Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Stephen Karel De Waal Malefyt, M.D.

Pediatrics Physician in Albany, NY · enumerated 2008.

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

National Provider Identifier

1245493337

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Registry record

Entity type Individual (Type 1)

Name Dr. Stephen Karel De Waal Malefyt

Credential M.D.

Sex Male

Practice address 391 Myrtle Ave, Suite 3a, Albany, NY, 12208

Phone (518) 262-5588

Enumeration date Jul 8, 2008

Last updated in NPPES Mar 23, 2016

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 247241 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 1245493337 active?

Yes, as of the latest NPPES snapshot, NPI 1245493337 is active (record last updated 2016-03-23).

How do I verify Stephen De Waal Malefyt's NPI record?

Cross-check NPI 1245493337 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 2016-03-23.