Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark D Carlson, MD

Internal Medicine Physician in Cedar Park, TX · enumerated 2005.

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

National Provider Identifier

1023008398

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Registry record

Entity type Individual (Type 1)

Name Mark D Carlson

Credential MD

Sex Male

Practice address 1905 S Lakeline Blvd Ste 4, Cedar Park, TX, 78613

Phone (512) 553-1921

Enumeration date Oct 26, 2005

Last updated in NPPES Apr 16, 2019

Taxonomy & licenses

207QG0300X Geriatric Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License Q2258 (TX) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 21230 (NE) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License Q2258 (TX) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License Q2258 (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
02601	Other	NE	BCBS
200269020A	Medicaid	KS	-
3600078	Other	NE	UHC
6452	Other	NE	MIDLANDS CHOICE
91186278513	Medicaid	NE	-

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 specialty is Mark Carlson?

Mark Carlson is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Mario Cendan Gerontology Nurse Practitioner · Cedar Park, TX NPI 1124512082 Loveleen Swami Adult Health Nurse Practitioner · Cedar Park, TX NPI 1255973558

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-04-16.