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MARIELLE MAHAN MD
NPI 1487115010
Ophthalmology in Bethesda, MD

Active since March 27, 2019PECOS EnrolledAccepts Medicare Assignment
5612 SHIELDS DR, BETHESDA, MD 20817(301) 571-4334 Get Directions Write a Review

NPPES record last updated: October 2, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Marielle Mahan Md NPPES

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

MARIELLE MAHAN MD (NPI 1487115010) is an individual ophthalmology provider in Bethesda, Maryland, licensed in Maryland (D0103387) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS, is affiliated with Ohsu Hospital And Clinics, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1487115010
Entity TypeIndividualFemale
Primary Taxonomy207W00000X
Provider Legal NameMARIELLE MAHANCredential: MD
Location Address5612 SHIELDS DRBethesda, MD 20817-3532
Mailing Address11300 Rockville Pike Ste 1202Rockville, MD 20852-3040 · (301) 896-0890 · Fax (301) 896-0968
Phone(301) 571-4334
Sole ProprietorNo
Medical School CMSGeorgetown University School Of MedicineGraduated 2019
Enumeration DateMarch 27, 2019
Last NPPES UpdateOctober 2, 2025
NPPES CertifiedOctober 2, 2025
✔ NPI 1487115010 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
Licenses✔ Licensed in MD · D0103387✔ Licensed in DC · MD600004334
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
Also ListedOphthalmology · Ophthalmic Plastic and Reconstructive SurgeryTaxonomy 207WX0200X · License D0103387 (MD), MD600004334 (DC)
5612 SHIELDS DR, Bethesda, MD 20817
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Secondary Practice Locations 2

Location 1811 Russell Ave Ste HGaithersburg, MD 20879-3510 · Phone (301) 571-4334
Location 24301 Connecticut Ave NW Ste 125Washington, DC 20008-2332 · Phone (301) 896-0890

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BridgeSpan Health Company, Moda Health Plan, Inc., Providence Health Plan and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Marielle Mahan Md 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.

PECOS PAC ID5294192365
PECOS Enrollment IDI20250926003205
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.

Areas of Expertise CMS Part B claims 3

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
21 services19 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
15 services15 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
11 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Ohsu Hospital And Clinics

Acute Care Hospitals · Portland, OR
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number380009
Location3181 SW Sam Jackson Park RoadPortland, OR 97239 · Multnomah County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20817 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$80.66 typical visit price
range $21.40 – $158.88
Typical copayment $20.16 (range $5.35 – $39.72)
Most-billed visit code 99213
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 2

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

ROSALIE L. BAIR, M.D., P. A.
Clinic/Center (Ophthalmologic Surgery)
5612 SHIELDS DR
BETHESDA, MD 20817
Montgomery County (301) 571-4334
DR. ROSALIE LYNN BAIR M.D.
Ophthalmology (Ophthalmic Plastic and Reconstructive Surgery)
5612 SHIELDS DR
BETHESDA, MD 20817
Montgomery County (301) 896-0890

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 Marielle Mahan's NPI number?

The NPI number for Marielle Mahan is 1487115010. It was assigned to this individual provider in the NPPES registry on March 27, 2019.

Where is Marielle Mahan located?

Marielle Mahan practices at 5612 Shields Dr, Bethesda, MD 20817. The listed phone number is (301) 571-4334.

What is Marielle Mahan's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Marielle Mahan enrolled in Medicare?

Yes. Marielle Mahan 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.

What insurance does Marielle Mahan accept?

Health plans from BridgeSpan Health Company, Moda Health Plan, Inc., Providence Health Plan and Regence BlueCross BlueShield of Oregon list Marielle Mahan 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.

Is Marielle Mahan affiliated with any hospitals?

According to CMS data, Marielle Mahan is affiliated with Ohsu Hospital And Clinics.

When was this NPI record last updated?

The NPPES record for Marielle Mahan was last updated on October 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.