Quick answers
- Does Mary Louise Lenahan accept Medicare assignment?
- Medicare's clinician data says Mary Louise Lenahan may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Mary Louise Lenahan see?
- In 2024, CMS data shows 303 Original Medicare patients and 914 services for Mary Louise Lenahan. This counts Original Medicare only and measures volume, not quality.
- What is Mary Louise Lenahan's NPI number?
- 1144216953. 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 Louise Lenahan, 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 | 303 |
|---|---|
| Services billed to Medicare | 914 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)229 services
- Destruction of precancer skin growth, 2-14 growths (17003)131 services
- Biopsy of related skin growth, first growth (11102)129 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)118 services
- Destruction of precancer skin growth, 1 growth (17000)93 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 cholesterol75%
- High blood pressure67%
- Arthritis53%
- Chronic kidney disease26%
- Anxiety24%
- Osteoporosis20%
Practice locations
Addresses where Mary Louise Lenahan is enrolled with Medicare (CMS data updated October 2, 2026).
- 6507 Transit Rd, Suite AEast Amherst, NY 14051 (716) 689‑4377
Group practices
Medicare enrollment lists Mary Louise Lenahan as a member of this group (CMS data updated October 2, 2026).
- Lenahan Dermatology PLLC7 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Other clinicians in Lenahan Dermatology PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1979 (47 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1144216953 |
| 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