ELENA BEATRIZ MIER-TROTTER M.D.
NPI 1891072633
Ophthalmology in Rockville, MD
About Elena Beatriz Mier-trotter M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELENA BEATRIZ MIER-TROTTER M.D. (NPI 1891072633) is an individual ophthalmology provider in Rockville, Maryland, licensed in Maryland (D0050580) and active in the NPI registry since November 2011. She is enrolled in Medicare PECOS and is a graduate of Other (1972).
NPPES Registry Identity
Specialties & Licenses
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
Elena Beatriz Mier-trotter 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 Elena Mier-trotter reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Gaithersburg, MD 20877
- Reassigned Medicare billing, District of Columbia enrollment
- 3 clinicians in this Medicare group
Gaithersburg, MD 20877
- Reassigned Medicare billing, District of Columbia enrollment
- 3 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 9
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.
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.
ROCKVILLE, MD 20852
N BETHESDA, 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 Elena Mier-trotter's NPI number?
The NPI number for Elena Mier-trotter is 1891072633. It was assigned to this individual provider in the NPPES registry on November 8, 2011.
Where is Elena Mier-trotter located?
Elena Mier-trotter practices at 11300 Rockville Pike Suite 1202, Rockville, MD 20852. The listed phone number is (301) 896-0890.
What is Elena Mier-trotter's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Elena Mier-trotter enrolled in Medicare?
Yes. Elena Mier-trotter 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 Elena Mier-trotter's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elena Mier-trotter reassigns Medicare benefits to 2 organizations: Argos Vision And Eye Care Center, LLC (Gaithersburg, MD) and Argos Vision Center, LLC (Gaithersburg, 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 Elena Mier-trotter's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Elena Mier-trotter accept?
Health plans from Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Louisiana and Providence Health Plan list Elena Mier-trotter 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 Elena Mier-trotter was last updated on November 8, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Elena Beatriz Mier-Trotter, M.D. · NPI 1891072633
Ophthalmology physician in Rockville, Maryland. Individual provider, active in the CMS NPPES registry since November 8, 2011.
## Identity
- **NPI:** 1891072633 (Entity type: Individual)
- **Enumerated:** November 8, 2011
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** D0050580 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 11300 ROCKVILLE PIKE, SUITE 1202, Rockville, MD 20852-3003
- **Phone:** (301) 896-0890 · **Fax:** (301) 896-0968
## 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): Argos Vision And Eye Care Center, LLC (NPI 1326316944, Gaithersburg, MD); Argos Vision Center, LLC (NPI 1255719787, Gaithersburg, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1972
## Record status
- **NPPES last updated:** November 8, 2011
- **Other identifiers:** Medicare UPIN H53471 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1891072633) · Data from the CMS NPPES public registry.