Marielle Mahan, MD
NPI 1487115010 · Ophthalmology Physician · Bethesda, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marielle Mahan, MD is a Ophthalmology Physician provider in Bethesda, MD (NPI 1487115010).
Provider details
- NPI number
- 1487115010
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- D0103387 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
47 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 21 | $66 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 15 | $133 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 11 | $89 |
Typical Medicare-allowed amounts for these services range $66–$133 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 62 | 61 |
| Methylprednisolone | 45 | 45 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 30 | 26 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 28 | 26 |
| Oxycodone Hcl | 28 | 28 |
| Methylprednisolone Sod Succ/Pfbrand: Solu-Medrol | 13 | — |
Practice location
Mailing address
Additional practice locations (2)
- 4301 Connecticut Ave Nw Ste 125Washington, DC 20008-2332Phone: (301) 896-0890
- 811 Russell Ave Ste HGaithersburg, MD 20879-3510Phone: (301) 571-4334
Registry dates
- Enumerated
- 2019-03-27
- Last updated
- 2025-10-02
- Certified
- 2025-10-02
Frequently asked questions
- What is Marielle Mahan's NPI number?
- Marielle Mahan's National Provider Identifier (NPI) is 1487115010, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marielle Mahan's specialty?
- Marielle Mahan is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Marielle Mahan located?
- Marielle Mahan's practice location on file with NPPES is 5612 Shields Dr, Bethesda, MD 20817-3532.
- What is Marielle Mahan's phone number?
- The practice phone number listed in the NPPES registry for Marielle Mahan is (301) 571-4334.
- Does Marielle Mahan accept Medicare?
- Marielle Mahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marielle Mahan's NPI active?
- Yes — Marielle Mahan's NPI (1487115010) is active in the NPPES registry as of the last update on 2025-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.