DR. MICHAEL LANGHAM WILLIAMS M.D.
NPI 1811375835
Emergency Medicine in Avon, IN
About Dr. Michael Langham Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL LANGHAM WILLIAMS M.D. (NPI 1811375835) is an individual emergency medicine provider in Avon, Indiana, licensed in Indiana (01099277A) and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Michael Langham Williams M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show Michael Williams reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Indianapolis, IN 46202
- Reassigned Medicare billing, Indiana enrollment
- 5,212 clinicians in this Medicare group
Russellville, AL 35653
- Reassigned Medicare billing, Alabama enrollment
- 286 clinicians in this Medicare group
Springfield, MO 65804
- Reassigned Medicare billing, Missouri enrollment
- 169 clinicians in this Medicare group
Shreveport, LA 71105
- Reassigned Medicare billing, Louisiana enrollment
- 90 clinicians in this Medicare group
Austin, TX 78705
- Reassigned Medicare billing, Texas enrollment
- 1,511 clinicians in this Medicare group
Sweetwater, TX 79556
- Reassigned Medicare billing, Texas enrollment
- 671 clinicians in this Medicare group
San Antonio, TX 78249
- Reassigned Medicare billing, Texas enrollment
- 379 clinicians in this Medicare group
Sedro Woolley, WA 98284
- Reassigned Medicare billing, Washington enrollment
- 139 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Indiana University Health
Acute Care Hospitals · Indianapolis, INAscension Providence
Acute Care Hospitals · Waco, TXShannon Medical Center
Acute Care Hospitals · San Angelo, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 46123 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Michael Williams's NPI number?
The NPI number for Michael Williams is 1811375835. It was assigned to this individual provider in the NPPES registry on May 11, 2015.
Where is Michael Williams located?
Michael Williams practices at 1111 N Ronald Reagan Pkwy, Avon, IN 46123. The listed phone number is (317) 217-3000.
What is Michael Williams's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Michael Williams enrolled in Medicare?
Yes. Michael Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Michael Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Williams reassigns Medicare benefits to 8 organizations: Iu Health Medical Group, LLC (Indianapolis, IN), App Of Alabama Ed PLLC (Russellville, AL), Mercy Hospital Springfield (Springfield, MO), Highland Emergency Group, LLC (Shreveport, LA), Travis County Emergency Physicians PA (Austin, TX) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Williams accept?
Health plans from Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan, CareSource and Sendero Health Plans, Local Nonprofit list Michael Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Michael Williams affiliated with any hospitals?
According to CMS data, Michael Williams is affiliated with Indiana University Health, Ascension Providence and Shannon Medical Center.
When was this NPI record last updated?
The NPPES record for Michael Williams was last updated on August 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Michael Langham Williams, M.D. · NPI 1811375835
Emergency Medicine physician in Avon, Indiana. Individual provider, active in the CMS NPPES registry since May 11, 2015.
## Identity
- **NPI:** 1811375835 (Entity type: Individual)
- **Enumerated:** May 11, 2015
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 01099277A (Indiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 1111 N RONALD REAGAN PKWY, Avon, IN 46123-7085
- **Phone:** (317) 217-3000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Iu Health Medical Group, LLC (NPI 1326893777, Indianapolis, IN); App Of Alabama Ed PLLC (NPI 1659646040, Russellville, AL); Mercy Hospital Springfield (NPI 1043242159, Springfield, MO); Highland Emergency Group, LLC (NPI 1154913861, Shreveport, LA); Travis County Emergency Physicians PA (NPI 1962440933, Austin, TX); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At Houston, class of 2015
## Record status
- **NPPES last updated:** August 17, 2026
- **Other identifiers:** Medicaid 300088583 (IN)
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Source: [NPI Profile](https://npiprofile.com/npi/1811375835) · Data from the CMS NPPES public registry.