MRS. JOY A HAMMACK CRNA
NPI 1831435023
Nurse Anesthetist, Certified Registered in Baltimore, MD
About Mrs. Joy A Hammack Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. JOY A HAMMACK CRNA (NPI 1831435023) is an individual nurse anesthetist, certified registered in Baltimore, Maryland, licensed in Maryland (91236) and active in the NPI registry since December 2012. She is affiliated with Johns Hopkins Howard County Medical Center and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mrs. Joy A Hammack Crna is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
8Medicare enrollment records show Joy Hammack reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- 148 clinicians in this Medicare group
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Towson, MD 21286
- Reassigned Medicare billing, Maryland enrollment
- 29 clinicians in this Medicare group
Lutherville, MD 21093
- Reassigned Medicare billing, Maryland enrollment
- 40 clinicians in this Medicare group
Ellicott City, MD 21043
- Reassigned Medicare billing, Maryland enrollment
- 9 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, Maryland enrollment
- 44 clinicians in this Medicare group
Jarrettsville, MD 21084
- Reassigned Medicare billing, Maryland enrollment
- 11 clinicians in this Medicare group
Philadelphia, PA 19106
- Reassigned Medicare billing, Maryland enrollment
- 10 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 7
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 Howard County Medical Center
Acute Care Hospitals · Columbia, MDMedicare 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 21201
BALTIMORE, MD 21201
BALTIMORE, MD 21201
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 Joy Hammack's NPI number?
The NPI number for Joy Hammack is 1831435023. It was assigned to this individual provider in the NPPES registry on December 17, 2012.
Where is Joy Hammack located?
Joy Hammack practices at 22 S Greene St, Baltimore, MD 21201. The listed phone number is (800) 492-5538.
What is Joy Hammack's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Joy Hammack enrolled in Medicare?
Yes. Joy Hammack is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Joy Hammack's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joy Hammack reassigns Medicare benefits to 8 organizations: University Of Maryland Medical System Corporation (Baltimore, MD), Johns Hopkins University (Baltimore, MD), Anesthesia Solutions, LLC (Towson, MD), Katzen Medical Associates, PC (Lutherville, MD), Blackwell Anesthesia LLC (Ellicott City, MD) and 3 more organizations, listed in the Medicare section above. 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 Joy Hammack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Joy Hammack affiliated with any hospitals?
According to CMS data, Joy Hammack is affiliated with Johns Hopkins Howard County Medical Center.
When was this NPI record last updated?
The NPPES record for Joy Hammack was last updated on October 16, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mrs. Joy A Hammack, CRNA · NPI 1831435023
Nurse Anesthetist, Certified Registered physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since December 17, 2012.
## Identity
- **NPI:** 1831435023 (Entity type: Individual)
- **Enumerated:** December 17, 2012
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 91236 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 22 S GREENE ST, Baltimore, MD 21201-1544
- **Phone:** (800) 492-5538
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): University Of Maryland Medical System Corporation (NPI 1508807355, Baltimore, MD); Johns Hopkins University (NPI 1295731966, Baltimore, MD); Anesthesia Solutions, LLC (NPI 1144360314, Towson, MD); Katzen Medical Associates, PC (NPI 1326052614, Lutherville, MD); Blackwell Anesthesia LLC (NPI 1053197343, Ellicott City, MD); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** October 16, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1831435023) · Data from the CMS NPPES public registry.