Gregory Sewall, MD
NPI 1336195023 · Otolaryngology Physician · Wausau, WI
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Sewall, MD is a Otolaryngology Physician provider in Wausau, WI (NPI 1336195023).
Provider details
- NPI number
- 1336195023
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 42332-020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
239 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 | 60 | $85 |
| Diagnostic Exam of Voice Box Using a Flexible Endoscope31575 | 48 | $119 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 45 | $104 |
| Diagnostic Exam of Nasal Passages Using an Endoscope31231 | 33 | $173 |
| Removal of Impacted Ear Wax69210 | 26 | $44 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 15 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 16 | 12 |
| Fluticasone Propionate | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$74 across 4 records (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
- 2006-05-25
- Last updated
- 2020-04-13
- Certified
- 2020-04-13
Frequently asked questions
- What is Gregory Sewall's NPI number?
- Gregory Sewall's National Provider Identifier (NPI) is 1336195023, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Sewall's specialty?
- Gregory Sewall is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Sewall located?
- Gregory Sewall's practice location on file with NPPES is 512 S 28th Ave, Wausau, WI 54401-4147.
- What is Gregory Sewall's phone number?
- The practice phone number listed in the NPPES registry for Gregory Sewall is (715) 847-2021.
- Does Gregory Sewall accept Medicare?
- Gregory Sewall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Sewall's NPI active?
- Yes — Gregory Sewall's NPI (1336195023) is active in the NPPES registry as of the last update on 2020-04-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.