National Provider Identifier
Mary Katherine Kosowski, A-GNP-C
Mary Katherine Kosowski, A-GNP-C is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner in West Seneca, NY and a listed phone number of (716) 332-2121.
Source: public NPPES record, last updated August 28, 2025. This profile is informational and is not medical advice, a quality rating, or a provider recommendation.
Profile Overview
- NPI
- 1558937441
- Provider Type
- Individual
- Primary Specialty
- Adult Health Nurse Practitioner
- Enumeration Date
- June 01, 2021
- Last Updated
- August 28, 2025
Practice Location
- 600 Harlem RD
- West Seneca, NY 14224-1151
Phone: (716) 332-2121
Specialties
- Adult Health Nurse Practitioner (363LA2200X)
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Medicare Part B Activity
Reported 208 Medicare fee-for-service service lines in 2024.
Peer comparison
Compared to Nurse Practitioner providers in the Buffalo, NY metro area.
This provider is in the 61st percentile for Medicare service volume.
Around the middle of the peer group.
Performs 36% more Medicare services than the peer median.
Higher than 471 of 775 peers.
- Activity Percentile
- 60.8%
- Rank by Services
- 304 of 775
- Total Services
- 208
- Est. Allowed Value
- $13,788.47
- Dataset Year
- 2024
- Drug Code Share
- 0.0%
Estimated allowed value reflects Medicare fee-for-service allowed amounts only. It does not include Medicare Advantage, commercial insurance, cash-pay services, or employment compensation.
Peers are grouped by the broader Nurse Practitioner classification rather than the exact subspecialty label shown elsewhere on the page.
Percentile distribution
Each bar represents a 10-point percentile band of peers by total Medicare services for Nurse Practitioner across the Buffalo, NY metro area. Taller bars indicate higher service-volume bands. Highlighted bar marks this provider's percentile band.
Observed service range: 11 to 11,907 total Medicare services.
Top Clinical Services
- 99213: Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
150 services | $10,820.06
- 95251: Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report
39 services | $1,004.35
- 99214: Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
19 services | $1,964.06
Full Record
- NPI
- 1558937441
- Entity Type
- Individual
- Last Name
- Kosowski
- First Name
- Mary Katherine
- Name Prefix
- Mrs.
- Credential
- A-GNP-C
- Mailing Street Address
- 600 Harlem RD
- Mailing City
- West Seneca
- Mailing State
- NY
- Mailing ZIP Code
- 14224-1151
- Mailing Country
- US
- Mailing Phone
- (716) 332-2121
- Mailing Fax
- (716) 332-2122
- Practice Street Address
- 600 Harlem RD
- Practice City
- West Seneca
- Practice State
- NY
- Practice ZIP Code
- 14224-1151
- Practice Country
- US
- Practice Phone
- (716) 332-2121
- Practice Fax
- (716) 332-2122
- Enumeration Date
- June 01, 2021
- Last Updated
- August 28, 2025
- Sex
- Female
- Sole Proprietor
- No
- Certification Date
- August 28, 2025
- Taxonomies
- Adult Health Nurse Practitioner (363LA2200X)