Gregory Ishimoto, M.D.
NPI 1164681896 · Family Medicine Physician · Manitowoc, WI
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Ishimoto, M.D. is a Family Medicine Physician provider in Manitowoc, WI (NPI 1164681896).
Provider details
- NPI number
- 1164681896
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
390 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 115 | $116 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 111 | $68 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 69 | $8 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 67 | $168 |
| Emergency Department Visit With Straightforward Medical Decision Making99282 | 28 | $40 |
Typical Medicare-allowed amounts for these services range $8–$168 (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 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ibuprofen | 106 | 84 |
| Prednisone | 61 | 59 |
| Gabapentin | 43 | 15 |
| Tramadol Hcl | 31 | 30 |
| Lisinopril | 31 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | 26 |
| Brexpiprazolebrand: Rexulti |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-06-06
- Last updated
- 2011-08-29
Frequently asked questions
- What is Gregory Ishimoto's NPI number?
- Gregory Ishimoto's National Provider Identifier (NPI) is 1164681896, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Ishimoto's specialty?
- Gregory Ishimoto is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Ishimoto located?
- Gregory Ishimoto's practice location on file with NPPES is 4100 Dewey St, Manitowoc, WI 54220-5497.
- What is Gregory Ishimoto's phone number?
- The practice phone number listed in the NPPES registry for Gregory Ishimoto is (805) 624-0615.
- Does Gregory Ishimoto accept Medicare?
- Gregory Ishimoto is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Ishimoto's NPI active?
- Yes — Gregory Ishimoto's NPI (1164681896) is active in the NPPES registry as of the last update on 2011-08-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.