Dr. John F. Keiser, MD, PHD

Dr. John F. Keiser is a Medical Microbiology Physician provider (Pathology) practicing in Washington, DC, registered in the NPPES registry with NPI 1720194103 since 2006. The credential MD stands for Doctor of Medicine.

✓ Active NPI ✓ Valid NPI checksum

NPI	1720194103
Entity type	Individual (Type 1)
Name	Dr. John F. Keiser
Credential	MD, PHD
Sex	Male
Practice address	900 23RD ST NW, Washington, DC, 20037
Phone	2029943391
Enumeration date	2006-08-21
Last updated in NPPES	2020-09-15

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
207ZP0105X	Clinical Pathology/Laboratory Medicine Physician	Secondary	MD15828	DC
207ZM0300X	Medical Microbiology Physician	Primary	MD15828	DC

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
028848500	Medicaid	DC	—

Copy-ready billing details

Provider: John Keiser, MD, PHD
NPI: 1720194103
Taxonomy: 207ZM0300X (Medical Microbiology Physician)
Address: 900 23RD ST NW, Washington, DC, 20037

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1528061058	Michael Hall	Individual	Diagnostic Radiology Physician	Washington, DC
1306841085	Mamoun Younes	Individual	Anatomic Pathology Physician	Washington, DC
1972502169	Kara Couch	Individual	Family Nurse Practitioner	Washington, DC
1568458297	District Hospital Partners L P	Organization	Psychiatric Hospital Unit	Washington, DC
1487640207	District Hospital Partners L P	Organization	General Acute Care Hospital	Washington, DC
1548257082	District Hospital Partners L P	Organization	Rehabilitation Hospital Unit	Washington, DC
1881684090	Jeffrey Berger	Individual	Anesthesiology Physician	Washington, DC
1629050612	Claudia Ranniger	Individual	Emergency Medicine Physician	Washington, DC

Verify this record

Cross-check NPI 1720194103 against the authoritative CMS record: view Dr. John F. Keiser on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Is NPI 1720194103 active?

Yes — as of the latest NPPES snapshot, NPI 1720194103 is active (record last updated 2020-09-15).

How do I verify John Keiser's NPI record?

Cross-check NPI 1720194103 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 2026-07-11. Provider record last updated 2020-09-15.