ALLISON J WILLIAMS MD
NPI 1588127237
Internal Medicine - Critical Care Medicine in Indianapolis, IN
About Allison J Williams Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALLISON J WILLIAMS MD (NPI 1588127237) is an individual critical care medicine provider in Indianapolis, Indiana, licensed in Indiana (01087598A) and active in the NPI registry since April 2019. She is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 4
Secondary Practice Locations 2
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Allison J Williams Md 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Indiana University Health
Acute Care Hospitals · Indianapolis, INPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 46254 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
INDIANAPOLIS, IN 46254
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 Allison Williams's NPI number?
The NPI number for Allison Williams is 1588127237. It was assigned to this individual provider in the NPPES registry on April 10, 2019.
Where is Allison Williams located?
Allison Williams practices at 5515 W 38th St, Indianapolis, IN 46254. The listed phone number is (317) 880-3838.
What is Allison Williams's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Allison Williams enrolled in Medicare?
Yes. Allison 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.
Is Allison Williams affiliated with any hospitals?
According to CMS data, Allison Williams is affiliated with Indiana University Health.
When was this NPI record last updated?
The NPPES record for Allison Williams was last updated on July 14, 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.
# Allison J Williams, MD · NPI 1588127237
Critical Care Medicine physician in Indianapolis, Indiana. Individual provider, active in the CMS NPPES registry since April 10, 2019.
## Identity
- **NPI:** 1588127237 (Entity type: Individual)
- **Enumerated:** April 10, 2019
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 01087598A (Indiana)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5515 W 38TH ST, Indianapolis, IN 46254-2995
- **Phone:** (317) 880-3838 · **Fax:** (317) 880-0081
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Medical school:** Indiana University School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** July 14, 2026
- **Other identifiers:** Medicaid 300026533 (IN); Other 1102306127 (IN)
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Source: [NPI Profile](https://npiprofile.com/npi/1588127237) · Data from the CMS NPPES public registry.