Quick answers
- Which hospitals does Joy A. Hammack work at?
- Medicare's official clinician data lists Joy A. Hammack at 1 hospital: Johns Hopkins Howard County Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Joy A. Hammack see patients?
- Medicare's clinician data lists 6 practice locations, including Aberdeen, MD, Columbia, MD and Ellicott City, MD. Call before your visit to confirm the address.
- What is Joy A. Hammack's specialty?
- Medicare lists Certified Registered Nurse Anesthetist (CRNA) as the primary specialty.
- Does Joy A. Hammack accept Medicare assignment?
- Medicare's clinician data says Joy A. Hammack may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Joy A. Hammack?
- (240) 394-4365, as listed in official Medicare / NPI Registry data.
- What is Joy A. Hammack's NPI number?
- 1831435023. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Joy A. Hammack works
Medicare's Facility Affiliation Data lists Joy A. Hammack at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Johns Hopkins Howard County Medical CenterColumbia, MD · Acute Care Hospital · CCN 210048
Practice locations
Addresses where Joy A. Hammack is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1111 Beards Hill Rd, Suite 700Aberdeen, MD 21001 (240) 394‑4365
- 5755 Cedar LnColumbia, MD 21044 (410) 740‑7890
- 6011 University Blvd, Suite 190Ellicott City, MD 21043 (410) 461‑0960
- 6231 N Charles StBaltimore, MD 21212 (410) 377‑2044
- 901 Dulaney Valley Rd, Suite 220Towson, MD 21204 (410) 583‑1000
Group practices
Medicare enrollment lists Joy A. Hammack as a member of these groups (CMS data updated 2026-10-02).
- Johns Hopkins University2,909 clinicians in the group
- Ultracare Anesthesia Partners LLC75 clinicians in the group
- Katzen Medical Associates PC23 clinicians in the group
- Anesthesia Solutions, LLC10 clinicians in the group
- Blackwell Anesthesia LLC7 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Maryland →
Other nurse anesthetists in Aberdeen
Clinicians with the same Medicare primary specialty in Aberdeen, MD — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1831435023 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians