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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MICHAEL AARON WILLIAMS M.D.
NPI 1215067236
Pediatrics in Charlottesville, VA

Active since March 07, 2007PECOS Enrolled
1204 W MAIN ST, CHARLOTTESVILLE, VA 22903(434) 924-0123(434) 243-3300 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 29, 2026, Aug 10, 2023, Oct 15, 2020 and 1 more (4 updates tracked since 2019).

About Michael Aaron Williams M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MICHAEL AARON WILLIAMS M.D. (NPI 1215067236) is an individual pediatrics provider in Charlottesville, Virginia, licensed in Virginia (0101257113) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS and maintains a secondary practice location in Charlottesville.

NPPES Registry Identity

NPI1215067236
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameMICHAEL AARON WILLIAMSCredential: M.D.
Location Address1204 W MAIN STCharlottesville, VA 22903-2824
Mailing AddressPo Box 749112Atlanta, GA 30374-9112
Phone(434) 924-0123
Fax(434) 243-3300
Sole ProprietorNo
Enumeration DateMarch 7, 2007
Last NPPES UpdateSeptember 29, 20264 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2026
✔ NPI 1215067236 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in VA · 0101257113
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
1204 W MAIN ST, Charlottesville, VA 22903
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Secondary Practice Location 1

Location 11215 Lee StCharlottesville, VA 22908-2824 · Phone (434) 924-0211

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michael Aaron Williams M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Michael Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Virginia Physicians Group
1.1 mi
Neuromusculoskeletal Medicine, Sports Medicine
4105 LEWIS AND CLARK DR
Charlottesville, VA 22911
  • Reassigned Medicare billing, Virginia enrollment
  • 2,820 clinicians in this Medicare group
NPI 1033138250 (434) 295-1000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22903 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$86.88 typical visit price
range $56.19 – $170.30
Typical copayment $21.72 (range $14.04 – $42.57)
Most-billed visit code 99203
Established Patient
$99.13 typical visit price
range $18.07 – $138.91
Typical copayment $24.78 (range $4.51 – $34.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

HEATHER STEVENS SPADER MD
Neurological Surgery
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 243-5749
DR. ASMA SHAHID HABIB M.D.
Pediatrics (Pediatric Cardiology)
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-9119
JENNIFER MOORE ANDREWS D.O.
Pediatrics
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-0123
WILLIAM G. WILSON M.D.
Medical Genetics (Clinical Genetics (M.D.))
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-0123
CHRISTIAN A. CHISHOLM MD
Obstetrics & Gynecology
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-2500
LINDA A. WAGGONER FOUNTAIN MD
Pediatrics (Pediatric Infectious Diseases)
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-0123
ANNE C BUTZ LCSW
Social Worker (Clinical)
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-5321
KEITH R. BACHMANN M.D.
Orthopaedic Surgery (Pediatric Orthopaedic Surgery)
1204 W MAIN ST
CHARLOTTESVILLE, VA 22903
Charlottesville City (434) 924-2301

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 1215067236. It was assigned to this individual provider in the NPPES registry on March 7, 2007.

Where is Michael Williams located?

Michael Williams practices at 1204 W Main St, Charlottesville, VA 22903. The listed phone number is (434) 924-0123.

What is Michael Williams's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Michael Williams enrolled in Medicare?

Yes. Michael Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Williams reassigns Medicare benefits to University Of Virginia Physicians Group (Charlottesville, VA). The 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 Oscar Health 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.

When was this NPI record last updated?

The NPPES record for Michael Williams was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.