MARIANNE H COWLEY MD
NPI 1811964448
Ophthalmology in Baltimore, MD
About Marianne H Cowley Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIANNE H COWLEY MD (NPI 1811964448) is an individual ophthalmology provider in Baltimore, Maryland, licensed in Maryland (D55897) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and maintains a secondary practice location in Louisville.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Marianne H Cowley Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Marianne Cowley reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Baltimore, MD 21287
- Reassigned Medicare billing, District of Columbia enrollment
- 67 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 12
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Hospital, The
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21287 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
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 Marianne Cowley's NPI number?
The NPI number for Marianne Cowley is 1811964448. It was assigned to this individual provider in the NPPES registry on March 2, 2006.
Where is Marianne Cowley located?
Marianne Cowley practices at 600 N Wolfe St, Baltimore, MD 21287. The listed phone number is (410) 955-5000.
What is Marianne Cowley's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Marianne Cowley enrolled in Medicare?
Yes. Marianne Cowley is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Marianne Cowley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marianne Cowley reassigns Medicare benefits to 2 organizations: Johns Hopkins University (Baltimore, MD) and Johns Hopkins University (Baltimore, MD). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marianne Cowley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Marianne Cowley affiliated with any hospitals?
According to CMS data, Marianne Cowley is affiliated with Johns Hopkins Hospital, The.
When was this NPI record last updated?
The NPPES record for Marianne Cowley was last updated on February 28, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.
# Marianne H Cowley, MD · NPI 1811964448
Ophthalmology physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since March 2, 2006.
## Identity
- **NPI:** 1811964448 (Entity type: Individual)
- **Enumerated:** March 2, 2006
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** D55897 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 N WOLFE ST, Baltimore, MD 21287-0005
- **Phone:** (410) 955-5000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1023018413, Baltimore, MD); Johns Hopkins University (NPI 1588638878, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1982
## Record status
- **NPPES last updated:** February 28, 2023
- **Other identifiers:** Medicaid 100394270A (IN); Medicaid 64244684 (KY)
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Source: [NPI Profile](https://npiprofile.com/npi/1811964448) · Data from the CMS NPPES public registry.