Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

ROBERT E SIMONSEN P.A.
NPI 1205888161
Physician Assistant - Surgical in Ellicott City, MD

Q: What is Robert Simonsen's NPI number?

The NPI number for Robert Simonsen is 1205888161. It was assigned to this individual provider in the NPPES registry on May 17, 2006.

Q: What is Robert Simonsen's specialty?

The primary specialty registered for this NPI is Physician Assistant, specializing in Surgical, with taxonomy code 363AS0400X.

Q: Is Robert Simonsen enrolled in Medicare?

No. Robert Simonsen has opted out of Medicare through October 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Robert Simonsen was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since May 17, 2006Opted out of Medicare · through Oct 1, 2027

3570 SAINT JOHNS LN, ELLICOTT CITY, MD 21042(410) 461-9500(410) 461-8945 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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About Robert E Simonsen P.a. NPPES

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

ROBERT E SIMONSEN P.A. (NPI 1205888161) is an individual surgical provider in Ellicott City, Maryland, licensed in Maryland (C00057) and active in the NPI registry since May 2006. He has opted out of Medicare through October 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1205888161

Entity TypeIndividualMale

Primary Taxonomy363AS0400X

Provider Legal NameROBERT E SIMONSENCredential: P.A.

Location Address3570 SAINT JOHNS LNEllicott City, MD 21042-4020

Mailing Address3570 Saint Johns LnEllicott City, MD 21042-4020 · (410) 461-9500 · Fax (410) 461-8945

Phone(410) 461-9500

Fax(410) 461-8945

Sole ProprietorNo

Enumeration DateMay 17, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1205888161 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician Assistant · SurgicalPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363AS0400X

License✔ Licensed in MD · C00057

3570 SAINT JOHNS LN, Ellicott City, MD 21042

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

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Opted out of Medicare

Robert E Simonsen P.a. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from October 1, 2013 through October 1, 2027.

Opt-Out Effective DateOctober 1, 2013

Opt-Out In Effect ThroughOctober 1, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

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Other Providers at the Same Location NPPES 19

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. KEVIN E MCGOVERN MD

Specialist