DR. STEVEN C MARES MD
NPI 1639144686
Pediatrics in Williamsburg, VA
About Dr. Steven C Mares Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEVEN C MARES MD (NPI 1639144686) is an individual pediatrics provider in Williamsburg, Virginia, licensed in Virginia (0101049927) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Steven C Mares Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
5Medicare enrollment records show Steven Mares reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Norfolk, VA 23507
- Reassigned Medicare billing, Virginia enrollment
- 549 clinicians in this Medicare group
Norfolk, VA 23502
- Reassigned Medicare billing, Virginia enrollment
- 1,901 clinicians in this Medicare group
Fredericksburg, VA 22401
- Reassigned Medicare billing, Virginia enrollment
- 547 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 1,417 clinicians in this Medicare group
Princeton, WV 24740
- Reassigned Medicare billing, West Virginia enrollment
- 280 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 23185 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 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WILLIAMSBURG, VA 23185
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 Steven Mares's NPI number?
The NPI number for Steven Mares is 1639144686. It was assigned to this individual provider in the NPPES registry on February 22, 2006.
Where is Steven Mares located?
Steven Mares practices at 1162 Professional Dr, Williamsburg, VA 23185. The listed phone number is (757) 253-5757.
What is Steven Mares's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Steven Mares enrolled in Medicare?
Yes. Steven Mares is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Steven Mares's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Mares reassigns Medicare benefits to 5 organizations: Childrens Specialty Group PLLC (Norfolk, VA), Sentara Medical Group (Norfolk, VA), Mary Washington Healthcare Physicians (Fredericksburg, VA), Children's Hospital (Washington, DC) and Princeton Community Hospital Assn Inc. (Princeton, WV). 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 Steven Mares's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Steven Mares accept?
Health plans from CareSource list Steven Mares 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 Steven Mares was last updated on December 3, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years 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. Steven C Mares, MD · NPI 1639144686
Pediatrics physician in Williamsburg, Virginia. Individual provider, active in the CMS NPPES registry since February 22, 2006.
## Identity
- **NPI:** 1639144686 (Entity type: Individual)
- **Enumerated:** February 22, 2006
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 0101049927 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 1162 PROFESSIONAL DR, Williamsburg, VA 23185
- **Phone:** (757) 253-5757 · **Fax:** (757) 229-0265
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Childrens Specialty Group PLLC (NPI 1255354130, Norfolk, VA); Sentara Medical Group (NPI 1265485270, Norfolk, VA); Mary Washington Healthcare Physicians (NPI 1295999852, Fredericksburg, VA); Children's Hospital (NPI 1780800128, Washington, DC); Princeton Community Hospital Assn Inc. (NPI 1093917643, Princeton, WV) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 3, 2012
- **Other identifiers:** Medicare UPIN G05190; Medicaid 010099803 (VA); Medicare ID-Type Unspecified 006236S33
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Source: [NPI Profile](https://npiprofile.com/npi/1639144686) · Data from the CMS NPPES public registry.