Masaru Ishii, M.D.,PH.D.
NPI 1427004381 · Otolaryngology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Masaru Ishii, M.D.,PH.D. is a Otolaryngology Physician provider in Baltimore, MD (NPI 1427004381).
Provider details
- NPI number
- 1427004381
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.,PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D59315 (MD)
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
20 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
472 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) |
|---|---|---|
| Diagnostic Exam of Nasal Passages Using an Endoscope31231 | 196 | $187 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 75 | $89 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 68 | $58 |
| Diagnostic Exam of Nasal Passages Using an Endoscope31231 | 55 | $60 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 29 | $66 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propionate | 74 | 39 |
| Azelastine Hcl | 69 | 34 |
| Ipratropium Bromide | 60 | 17 |
| Famotidine | 34 | 29 |
| Prednisone | 34 | 28 |
| Doxycycline Monohydrate | 33 | 28 |
| Mupirocin | 32 | 21 |
| Budesonide | 16 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-25
- Last updated
- 2013-02-08
Frequently asked questions
- What is Masaru Ishii's NPI number?
- Masaru Ishii's National Provider Identifier (NPI) is 1427004381, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Masaru Ishii's specialty?
- Masaru Ishii is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Masaru Ishii located?
- Masaru Ishii's practice location on file with NPPES is 4940 Eastern Ave, Baltimore, MD 21224-2735.
- What is Masaru Ishii's phone number?
- The practice phone number listed in the NPPES registry for Masaru Ishii is (410) 550-2368.
- Does Masaru Ishii accept Medicare?
- Masaru Ishii is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Masaru Ishii's NPI active?
- Yes — Masaru Ishii's NPI (1427004381) is active in the NPPES registry as of the last update on 2013-02-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.