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

Dr. Mark Steven Friedlander, M.D.

Psychiatry Physician in Narberth, PA · enumerated 2007.

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

National Provider Identifier

1447459847

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Steven Friedlander

Credential M.D.

Sex Male

Practice address Narberth, PA, 19072

Phone (610) 783-4135

Fax (610) 783-4100

Enumeration date Jul 16, 2007

Last updated in NPPES Jul 16, 2007

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

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License MD040945L (PA) Primary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License MD040945L (PA) Secondary

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 1447459847 active?

Yes, as of the latest NPPES snapshot, NPI 1447459847 is active (record last updated 2007-07-16).

How do I verify Mark Friedlander's NPI record?

Cross-check NPI 1447459847 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-16.