Mark L Williams, MD

Primary specialty

Anesthesiology PhysicianTaxonomy code 207L00000X

License

U4048 Issued in TX

Practice address

12222 Merit Dr Ste 600
Dallas, TX 75251-3294

Phone

(972) 715-5000

Fax

(972) 715-9976

NPI assigned

Jul 6, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in TX

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Anesthesiology

Education

Other, 1986

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

U S Anesthesia Partners of Texas, PAGroup PAC ID 7315850351, 2,750 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Honor Health John C. Lincoln Medical Center Hospital, Phoenix, AZ, CCN 030014
• Methodist Richardson Medical Center Hospital, Richardson, TX, CCN 450537

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• U. S. Anesthesia Partners of Texas, P.a.,

  dba Greater Houston Anesthesiology, P.A.

  • Anesthesiology Physician
  • Houston, TX
  • NPI 1548208564
  Medicare reassignment Care Compare group
• Valley Anesthesiology Consultants, Inc.

  • Anesthesiology Physician
  • Phoenix, AZ
  • NPI 1285660704
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Methodist Hospitals of Dallas

  dba Methodist Richardson Medical Center

  • General Acute Care Hospital
  • Richardson, TX
  • NPI 1033165501
  Care Compare affiliation
• Honorhealth

  dba HonorHealth John C. Lincoln Medical Center

  • General Acute Care Hospital
  • Phoenix, AZ
  • NPI 1770690695
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1152144000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776816000000",
    "number": "1679505440",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 13385",
            "city": "SCOTTSDALE",
            "state": "AZ",
            "postal_code": "852673385",
            "telephone_number": "480-609-9300",
            "fax_number": "480-609-9350"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "12222 MERIT DR STE 600",
            "city": "DALLAS",
            "state": "TX",
            "postal_code": "752513294",
            "telephone_number": "972-715-5000",
            "fax_number": "972-715-9976"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "250 E DUNLAP AVE",
            "address_purpose": "LOCATION",
            "city": "PHOENIX",
            "state": "AZ",
            "postal_code": "85020",
            "country_code": "US",
            "telephone_number": "602-273-9333",
            "fax_number": "480-609-9350",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "MARK",
        "middle_name": "L",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-06",
        "last_updated": "2026-04-22",
        "certification_date": "2026-04-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "AZ",
            "license": "22063",
            "primary": false
        },
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "TX",
            "license": "U4048",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lisa Williams, LMSW
• Lisa Renee Williams, AGACNP-BC
• Lynda J Williams, LPC-S, LCDC
• Maggie Williams, MTBC
• Mark Williams, PH.D.
• Marlene Rolynn Williams, REGISTERED NURSE
• Marlina Williams, LMT
• Martha Spring Williams, PSYCHOLOGIST
• Marvin Williams, MSSW
• Marya Williams, RPH

• Anesthesiology Physician in Dallas, TX
• Providers in Dallas, TX by specialty
• Anesthesiology Physician in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 22, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.