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Edit this profileWhere to find Marielle Mahan, MD
- Bethesda location main office
5612 Shields Dr, Bethesda, MD 20817 - Gaithersburg location
811 Russell Ave Ste H, Gaithersburg, MD 20879 - Washington location
4301 Connecticut Ave NW Ste 125, Washington, DC 20008
About Dr. Mahan
Marielle Mahan, MD is a healthcare provider in Bethesda, MD specializing in ophthalmology. Marielle trained at Georgetown University School of Medicine, graduating in 2019. According to Medicare claims data, Marielle cared for 45 Medicare patients across 47 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. This provider record is associated with NPI 1487115010.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (301) 571-4334
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
5612 SHIELDS DR
Bethesda, MD 20817
811 Russell Ave Ste H
Gaithersburg, MD 20879
4301 Connecticut Ave NW Ste 125
Washington, DC 20008
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Eye injury and cancer
Inflammation, neurologic, and orbit
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
Eye injuries
Retina & vitreous
Procedures & services
Cataract and lens
- Cataract surgery with lens implant
- Laser-assisted cataract surgery
- Intraocular lens exchange
- YAG laser capsulotomy
Cornea and refractive
Emergency and minor
- Corneal rust-ring removal
- Removal of an eye foreign body
- Repair of an eye or eyelid laceration
- Repair of ruptured globe
Examination and imaging
- Eye ultrasound
- Slit-lamp examination
- Visual-field testing
- Corneal topography
- Fluorescein angiography
Eyelid, tear duct, and muscle
- Chalazion removal
- Ectropion repair
- Eyelid surgery
- Tear-duct probing
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Tear-duct bypass surgery
Glaucoma
- Cyclophotocoagulation
- Trabeculectomy
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Retina
Most searched procedures
Corneal procedures
Eye diagnostics
Eye injuries
Eyelid surgery
Laser eye surgery
Laser procedures
Laser vision correction
Refractive surgery
Tear duct & Orbit
Procedures Most Often Billed to Medicare
47 services · 45 patients · 3 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
21 | Less often than most peers in Ophthalmology |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
15 | Less often than most peers in Ophthalmology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
11 | Less often than most peers in Ophthalmology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other eye doctors at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 1
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other eye doctors in Bethesda 7
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Georgetown University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2019 at Georgetown University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Mahan specialize in?
Dr. Mahan is an eye doctor in Bethesda, MD. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology”.
NPI registry
Where is Dr. Mahan located?
Dr. Mahan is listed at 5612 Shields Dr, Bethesda, MD 20817. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Mahan's phone number?
The number on file is (301) 571-4334. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Mahan's NPI number?
Dr. Mahan's National Provider Identifier is 1487115010. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Mahan go to medical school?
Dr. Mahan attended Georgetown University School of Medicine, graduating in 2019. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Mahan been practicing?
Dr. Mahan has 7 years experience. Calculated from a graduation year of 2019, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Mahan do most often?
According to Medicare billing data, Dr. Mahan the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Mahan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Mahan. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.