William B Ewen, MD - Medicare Emergency Medicine in Round Rock, TX

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William B Ewen, MD is a medicare enrolled "Emergency Medicine" physician in Round Rock, Texas. His current practice location is 300 University Blvd, Round Rock, Texas. You can reach out to his office (for appointments etc.) via phone at (512) 509-0100.

William B Ewen is licensed to practice in Texas (license number N6286) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1538355490.

Contact Information

William B Ewen, MD
300 University Blvd,
Round Rock, TX 78665-1032
(512) 509-0100
Not Available

Map and Direction




Physician's Profile

Full NameWilliam B Ewen
GenderMale
SpecialityEmergency Medicine
Location300 University Blvd, Round Rock, Texas
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1538355490
  • Provider Enumeration Date: 09/24/2007
  • Last Update Date: 08/18/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 3274690987
  • Enrollment ID: I20101116000195

Medical Identifiers

Medical identifiers for William B Ewen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1538355490NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207PE0004XEmergency Medicine - Emergency Medical Services N6286 (Texas)Secondary
207P00000XEmergency Medicine N6286 (Texas)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. William B Ewen allows following entities to bill medicare on his behalf.
Entity NameUniversity Of Texas Southwestern Medical Center At Dallas
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1942270566
PECOS PAC ID: 0648188250
Enrollment ID: O20031106000792
Entity NameThird Coast Emergency Physicians Southwest Pa
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1497793475
PECOS PAC ID: 6800794447
Enrollment ID: O20031222000126

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. William B Ewen is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
William B Ewen, MD
Po Box 844658,
Dallas, TX 75284-4658

Ph: (254) 724-2111		William B Ewen, MD
300 University Blvd,
Round Rock, TX 78665-1032

Ph: (512) 509-0100

Reviews and Comments


Emergency Medicine Doctors in Round Rock, TX

Clarke Worley Goodman, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2400 Round Rock Ave, Round Rock, TX 78681
Phone: 512-341-1000    
Dr. Jaclyn Ngoc Minh Nguyen, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 300 University Blvd, Round Rock, TX 78665
Phone: 512-509-0100    
Christopher Wallace, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 300 University Blvd, Round Rock, TX 78665
Phone: 512-509-0100    Fax: 512-218-6330
Kristen Faye Walker, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3341 Winding River Trl, Round Rock, TX 78681
Phone: 325-260-9002    
Dr. Peter John Richerson, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 300 University Blvd, Round Rock, TX 78665
Phone: 512-509-0100    
Dr. James Porter Mcdonough Iii, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 300 University Blvd, Round Rock, TX 78665
Phone: 512-509-0100    
Jordan Scaff,
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2400 Round Rock Ave, Round Rock, TX 78681
Phone: 512-341-1000    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.