Marianne H. Cowley, MD
Ophthalmology Physician · Baltimore, MD
Marianne H. Cowley, MD is an ophthalmology physician with a practice address in Baltimore, Maryland, and NPI 1811964448, issued on Mar 2, 2006. Check the license (Maryland D55897, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Marianne H. Cowley
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- D55897 MD
24468 KY
Self-reported in NPPES; status is on the state search - Practice location
- 600 N Wolfe St, Baltimore, MD 21287
- Phone
- (410) 955-5000
- Enumerated
- Mar 2, 2006
- Record last updated
- Feb 28, 2023
- Medicaid IDs
- 100394270A IN
64244684 KY - Medicare enrollment
- Enrolled (PECOS I20230313001643); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 588 in Maryland → Look up another NPI →
Also registered at 600 N Wolfe St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marianne H. Cowley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D55897Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average ophthalmology physician in 2024
159 Medicare Part D claims for 44 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 45% of claims.
Most prescribed
- Prednisolone Acetate42 claims
- Brimonidine Tartrate19 claims
- Ketorolac Tromethamine13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Johns Hopkins UniversityFrederick, MD
- Johns Hopkins UniversityMiddle River, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marianne H. Cowley among 588 ophthalmology physician records in Maryland
Marianne H. Cowley, MD is one of 588 ophthalmology physician records with a practice address in Maryland. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 44% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1982 · median 2002 among the 369 with a school on file
- Record last updated2023 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Maryland
There are 588 ophthalmology physician records in Maryland.
All 588 in Maryland → Every provider in Baltimore → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Esen Akpek, M.D.Baltimore, MD 212871851356943
- John Baer, M.D.Baltimore, MD 212871013984848
- Heather Bartlett Casparis, M.D.Baltimore, MD 212871629033147
- Neil Bressler, M.D.Baltimore, MD 212871790742245
- Peter Campochiaro, M.D.Baltimore, MD 212871598723850
- Earl Craven, MDBaltimore, MD 212871457354821
- Morton Goldberg, M.D.Baltimore, MD 212871578516696
- Laura Green, M.D.Baltimore, MD 212871255382263
Common questions
What is Marianne H. Cowley, MD's NPI number?
Marianne H. Cowley, MD's National Provider Identifier (NPI) is 1811964448, issued on Mar 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marianne H. Cowley, MD located?
The NPPES record lists a practice address at 600 N Wolfe St, Baltimore, MD, 21287. Phone: (410) 955-5000. Providers update this record themselves, so call before visiting.
How can I verify Marianne H. Cowley, MD's license?
NPPES lists Maryland license number D55897, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marianne H. Cowley, MD prescribe under Medicare Part D?
In 2024, Marianne H. Cowley, MD had 159 Medicare Part D claims for 44 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Marianne H. Cowley, MD's MIPS final score?
The 2023 MIPS final score is 74.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.