Genta Ishikawa, M.D
NPI 1336556208 · Internal Medicine Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Genta Ishikawa, M.D is a Internal Medicine Physician provider in New Haven, CT (NPI 1336556208).
Provider details
- NPI number
- 1336556208
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- 466863 (ZZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
195 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 46 | $217 |
| Test to Measure Rate of Airflow94375 | 30 | $14 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 28 | $9 |
| Test to Determine Lung Volumes Using Gas Dilution Or Washout94727 | 27 | $12 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 26 | $148 |
| Test for Exercise-Induced Lung Stress94618 | 24 | $22 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Nintedanib Esylatebrand: Ofev | 35 |
| Prednisone | 34 |
| Fluticasone Propionate | 19 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 12 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-07-12
- Last updated
- 2025-09-11
- Certified
- 2020-10-07
Frequently asked questions
- What is Genta Ishikawa's NPI number?
- Genta Ishikawa's National Provider Identifier (NPI) is 1336556208, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Genta Ishikawa's specialty?
- Genta Ishikawa is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Genta Ishikawa located?
- Genta Ishikawa's practice location on file with NPPES is 20 York St, New Haven, CT 06510-3220.
- What is Genta Ishikawa's phone number?
- The practice phone number listed in the NPPES registry for Genta Ishikawa is (203) 785-4162.
- Does Genta Ishikawa accept Medicare?
- Genta Ishikawa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Genta Ishikawa's NPI active?
- Yes — Genta Ishikawa's NPI (1336556208) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.