Quick answers
- Does Katherine J. Maas accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine J. Maas accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Katherine J. Maas see?
- In 2024, CMS data shows 26 Original Medicare patients and 141 services for Katherine J. Maas. This counts Original Medicare only and measures volume, not quality.
- What is Katherine J. Maas's NPI number?
- 1831701317. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Katherine J. Maas, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 26 |
|---|---|
| Services billed to Medicare | 141 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)119 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Anxiety75%
- High cholesterol69%
- Depression62%
- Arthritis50%
- High blood pressure46%
Practice locations
Addresses where Katherine J. Maas is enrolled with Medicare (CMS data updated October 2, 2026).
- 1511 Ritchie Hwy, Suite 202Arnold, MD 21012 (410) 757‑2077
- 1662 Village GrnCrofton, MD 21114 (410) 757‑2077
Group practices
Medicare enrollment lists Katherine J. Maas as a member of this group (CMS data updated October 2, 2026).
- Arundel Mental Health Professionals LC119 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Arnold
Clinicians with the same Medicare primary specialty in Arnold, MD — not a recommendation.
Other clinicians in Arundel Mental Health Professionals LC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1831701317 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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