MARIAM MATHAI M.D.
NPI 1346694668
Ophthalmology - Retina Specialist in Rockville, MD
About Mariam Mathai M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIAM MATHAI M.D. (NPI 1346694668) is an individual retina specialist in Rockville, Maryland, licensed in Maryland (D0089331) and active in the NPI registry since April 2016. She is enrolled in Medicare PECOS and is a graduate of Icahn School Of Medicine At Mount Sinai (2016).
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 and accepts Medicare assignment
Mariam Mathai 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
2Medicare enrollment records show Mariam Mathai reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 74 clinicians in this Medicare group
Greenbelt, MD 20770
- Reassigned Medicare billing, District of Columbia, Maryland and Virginia enrollments
- 69 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 16
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20852 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 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ROCKVILLE, MD 20852
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 Mariam Mathai's NPI number?
The NPI number for Mariam Mathai is 1346694668. It was assigned to this individual provider in the NPPES registry on April 22, 2016.
Where is Mariam Mathai located?
Mariam Mathai practices at 600 Jefferson Plz Ste 320, Rockville, MD 20852. The listed phone number is (301) 315-2198.
What is Mariam Mathai's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Retina Specialist, with taxonomy code 207WX0107X.
Is Mariam Mathai enrolled in Medicare?
Yes. Mariam Mathai 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 Mariam Mathai's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariam Mathai reassigns Medicare benefits to 2 organizations: Washington National Eye Center (Washington, DC) and The Retina Group Of Washington, PLLC (Greenbelt, MD). 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 Mariam Mathai's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mariam Mathai accept?
Health plans from Oscar Health list Mariam Mathai 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 Mariam Mathai was last updated on October 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.
# Mariam Mathai, M.D. · NPI 1346694668
Retina Specialist physician in Rockville, Maryland. Individual provider, active in the CMS NPPES registry since April 22, 2016.
## Identity
- **NPI:** 1346694668 (Entity type: Individual)
- **Enumerated:** April 22, 2016
- **Primary specialty:** Ophthalmology - Retina Specialist · taxonomy 207WX0107X
- **State license:** D0089331 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 600 JEFFERSON PLZ STE 320, Rockville, MD 20852-1197
- **Phone:** (301) 315-2198 · **Fax:** (301) 315-2187
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Washington National Eye Center (NPI 1437175684, Washington, DC); The Retina Group Of Washington, PLLC (NPI 1225001654, Greenbelt, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2016
## Record status
- **NPPES last updated:** October 8, 2026
- **Other identifiers:** Medicaid 30015515190003 (VA); Medicaid 799189400 (MD); Medicaid 091737867 (DC)
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Source: [NPI Profile](https://npiprofile.com/npi/1346694668) · Data from the CMS NPPES public registry.