NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

J. Marcus Downs, MD

Colon & Rectal Surgery Physician in Dallas, TX · enumerated 2006.

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

National Provider Identifier

1811922610

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name J. Marcus Downs
Credential MD
Sex Male
Practice address 8315 Walnut Hill Ln, Suite 220, Dallas, TX, 75231
Phone (214) 363-6123
Fax (866) 644-6809
Enumeration date Jul 11, 2006
Last updated in NPPES Mar 30, 2021

Taxonomy & licenses

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License J3086 (TX) 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
099181203 Medicaid TX -
099181201 Medicaid TX -

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

How do I verify J. Marcus Downs's NPI record?
Cross-check NPI 1811922610 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1811922610 active?
Yes, as of the latest NPPES snapshot, NPI 1811922610 is active (record last updated 2021-03-30).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-30.