MARY CATHERINE DRENNAN LCSW-C
NPI 1174756761
Social Worker - Clinical in Randallstown, MD
About Mary Catherine Drennan Lcsw-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY CATHERINE DRENNAN LCSW-C (NPI 1174756761) is an individual clinical provider in Randallstown, Maryland, licensed in Maryland (09078) and active in the NPI registry since August 2009. She is enrolled in Medicare PECOS and is a graduate of Other (1980).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mary Catherine Drennan Lcsw-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Mary Drennan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Timonium, MD 21093
- Reassigned Medicare billing, Maryland enrollment
- 116 clinicians in this Medicare group
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- 213 clinicians in this Medicare group
Coral Gables, FL 33134
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 38 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21133 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 11
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
RANDALLSTOWN, MD 21133
RANDALLSTOWN, MD 21133
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 Mary Drennan's NPI number?
The NPI number for Mary Drennan is 1174756761. It was assigned to this individual provider in the NPPES registry on August 28, 2009.
Where is Mary Drennan located?
Mary Drennan practices at 3510 Brenbrook Dr, Randallstown, MD 21133. The listed phone number is (410) 837-2050.
What is Mary Drennan's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Mary Drennan enrolled in Medicare?
Yes. Mary Drennan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mary Drennan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Drennan reassigns Medicare benefits to 3 organizations: Psych Associates Of Maryland LLC (Timonium, MD), Chase Brexton Health Services, Inc. (Baltimore, MD) and Sailor Health Medical PA (Coral Gables, FL). 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 Mary Drennan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mary Drennan was last updated on August 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Mary Catherine Drennan, LCSW-C · NPI 1174756761
Clinical provider in Randallstown, Maryland. Individual provider, active in the CMS NPPES registry since August 28, 2009.
## Identity
- **NPI:** 1174756761 (Entity type: Individual)
- **Enumerated:** August 28, 2009
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 09078 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 3510 BRENBROOK DR, Randallstown, MD 21133-4902
- **Phone:** (410) 837-2050 · **Fax:** (866) 629-0091
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Psych Associates Of Maryland LLC (NPI 1891721981, Timonium, MD); Chase Brexton Health Services, Inc. (NPI 1588606305, Baltimore, MD); Sailor Health Medical PA (NPI 1841012960, Coral Gables, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1980
## Record status
- **NPPES last updated:** August 16, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1174756761) · Data from the CMS NPPES public registry.