Howard Masuoka, MD
NPI 1770630162 · Gastroenterology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Howard Masuoka, MD is a Gastroenterology Physician provider in Stanford, CA (NPI 1770630162).
Provider details
- NPI number
- 1770630162
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C184254 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
689 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 136 | $145 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 134 | $88 |
| Measurement of Liver Stiffness91200 | 99 | $19 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 75 | $132 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 59 | $184 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ursodiol | 32 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 30 | 30 |
| Tenofovir Disoproxil Fumarate | 28 | — |
| Furosemide | 19 | — |
| Amiloride Hcl | 18 | — |
| Lactulose | 16 | — |
| Semaglutidebrand: Ozempic | 16 | — |
| Rifaximin |
Practice location
Mailing address
Additional practice locations (1)
- 550 University BlvdIndianapolis, IN 46202-5149Phone: (317) 274-4377
Registry dates
- Enumerated
- 2007-01-05
- Last updated
- 2025-02-06
- Certified
- 2025-02-06
Frequently asked questions
- What is Howard Masuoka's NPI number?
- Howard Masuoka's National Provider Identifier (NPI) is 1770630162, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Howard Masuoka's specialty?
- Howard Masuoka is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Howard Masuoka located?
- Howard Masuoka's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Howard Masuoka's phone number?
- The practice phone number listed in the NPPES registry for Howard Masuoka is (650) 723-4000.
- Does Howard Masuoka accept Medicare?
- Howard Masuoka is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Howard Masuoka's NPI active?
- Yes — Howard Masuoka's NPI (1770630162) is active in the NPPES registry as of the last update on 2025-02-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.