Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert I Markenson, M.D.

Orthopaedic Surgery Physician in Saint Louis, MO · enumerated 2006.

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

National Provider Identifier

1104870096

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Registry record

Entity type Individual (Type 1)

Name Dr. Robert I Markenson

Credential M.D.

Sex Male

Practice address 12152 Tesson Ferry Rd, Saint Louis, MO, 63128

Phone (314) 849-5414

Fax (314) 849-2042

Enumeration date May 22, 2006

Last updated in NPPES Nov 18, 2008

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 36092 (MO) 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
137009	Other	MO	HEALTHLINK
25688	Other	MO	BLUE CROSS BLUE SHEILD
004011602	Other	MO	MEDICARE
200023002	Other	MO	MEDICARE RAILROAD
338799	Other	MO	GROUP HEALTH PLAN
0900044	Other	MO	UNITED HEALTHCARE
951690	Other	MO	AETNA

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

What is the NPI number for Robert Markenson?

The National Provider Identifier (NPI) for Robert Markenson is 1104870096, a Type 1 (individual) record in the CMS NPPES registry.

Where does Robert Markenson practice?

The practice location on file with NPPES is in Saint Louis, MO. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-18.