Marianne Cowley, MD
NPI 1811964448 · Ophthalmology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marianne Cowley, MD is a Ophthalmology Physician provider in Baltimore, MD (NPI 1811964448).
Provider details
- NPI number
- 1811964448
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 24468 (KY)
Specialties & taxonomies
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,223 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) |
|---|---|---|
| Imaging of Retina92134 | 459 | $41 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 222 | $91 |
| Injection of Drug Into Eye67028 | 187 | $116 |
| Established Patient Complete Exam of Visual System92014 | 149 | $127 |
| Compounded Drug, Not Otherwise ClassifiedJ7999 | 65 | $84 |
| New Patient Complete Exam of Visual System92004 | 54 | $149 |
| Photography of the Retina |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisolone Acetate | 42 | 15 |
| Brimonidine Tartrate | 19 | — |
| Ketorolac Tromethamine | 13 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 3103 Breckenridge LnSte 2Louisville, KY 40220Phone: (502) 499-8980Fax: (502) 499-8294
Registry dates
- Enumerated
- 2006-03-02
- Last updated
- 2023-02-28
- Certified
- 2023-02-28
Frequently asked questions
- What is Marianne Cowley's NPI number?
- Marianne Cowley's National Provider Identifier (NPI) is 1811964448, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marianne Cowley's specialty?
- Marianne Cowley is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Marianne Cowley located?
- Marianne Cowley's practice location on file with NPPES is 600 N Wolfe St, Baltimore, MD 21287-0005.
- What is Marianne Cowley's phone number?
- The practice phone number listed in the NPPES registry for Marianne Cowley is (410) 955-5000.
- Does Marianne Cowley accept Medicare?
- Marianne Cowley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marianne Cowley's NPI active?
- Yes — Marianne Cowley's NPI (1811964448) is active in the NPPES registry as of the last update on 2023-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.