Quick answers
- Does Mary Tiffin accept Medicare assignment?
- Yes. Medicare's clinician data says Mary Tiffin 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 Mary Tiffin see?
- In 2024, CMS data shows 41 Original Medicare patients and 323 services for Mary Tiffin. This counts Original Medicare only and measures volume, not quality.
- What is Mary Tiffin's NPI number?
- 1790557205. 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 Mary Tiffin, 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 | 41 |
|---|---|
| Services billed to Medicare | 323 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Psychotherapy, 45 minutes (90834)230 services
- Psychotherapy, 30 minutes (90832)51 services
- Psychiatric diagnostic evaluation (90791)24 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).
- High blood pressure75%
- Depression75%
- Anxiety75%
- High cholesterol73%
- Arthritis68%
- Diabetes56%
Practice locations
Addresses where Mary Tiffin is enrolled with Medicare (CMS data updated October 2, 2026).
- 146 E King St, Unit 1022Lancaster, PA 17602 (301) 593‑1315
- 8575 Rixlew LnManassas, VA 20109 (301) 593‑1315
Group practices
Medicare enrollment lists Mary Tiffin as a member of this group (CMS data updated October 2, 2026).
- Psychogeriatric Services LLC121 clinicians in the group
Specialties
- Clinical Social Workerprimary
Find other clinicians: Clinical Social Worker, Pennsylvania →
Other clinical social workers in Lancaster
Clinicians with the same Medicare primary specialty in Lancaster, PA — not a recommendation.
Other clinicians in Psychogeriatric Services LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| School | Pennsylvania State University College Of Medicine |
| Graduation year | 2022 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790557205 |
| 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