William Gassmann, MS RN NPP
NPI 1033390885 · Psychiatric/Mental Health Nurse Practitioner · Clifton Springs, NY
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Gassmann, MS RN NPP is a Psychiatric/Mental Health Nurse Practitioner provider in Clifton Springs, NY (NPI 1033390885).
Provider details
- NPI number
- 1033390885
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- MS RN NPP
- Sex
- Male
- Sole proprietor
- No
- License
- 4929851 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
70 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 70 | $56 |
Typical Medicare-allowed amounts for these services range $56–$56 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bupropion Hclbrand: Bupropion Xl | 200 | 35 |
| Trazodone Hcl | 189 | 47 |
| Sertraline Hcl | 149 | 22 |
| Quetiapine Fumarate | 139 | 31 |
| Aripiprazole | 131 | 25 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 128 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$18 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-11-21
- Last updated
- 2025-02-19
- Certified
- 2025-02-19
Frequently asked questions
- What is William Gassmann's NPI number?
- William Gassmann's National Provider Identifier (NPI) is 1033390885, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gassmann's specialty?
- William Gassmann is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Gassmann located?
- William Gassmann's practice location on file with NPPES is 2 Coulter Rd, Clifton Springs, NY 14432-1122.
- What is William Gassmann's phone number?
- The practice phone number listed in the NPPES registry for William Gassmann is (315) 462-1050.
- Does William Gassmann accept Medicare?
- William Gassmann is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Gassmann's NPI active?
- Yes — William Gassmann's NPI (1033390885) is active in the NPPES registry as of the last update on 2025-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.