Michael Massaro
NPI 1558741447 · Gastroenterology Physician · Carmichael, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Massaro is a Gastroenterology Physician provider in Carmichael, CA (NPI 1558741447).
Provider details
- NPI number
- 1558741447
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- A172725 (CA)
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
11 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
722 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 149 | $141 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 102 | $182 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 100 | $243 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 88 | $96 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 57 | $84 |
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 |
|---|---|---|
| Pantoprazole Sodium | 224 | 78 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 187 | 175 |
| Omeprazole | 186 | 64 |
| Nortriptyline Hcl | 41 | 16 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 38 | 36 |
| Linaclotidebrand: Linzess | 27 | 12 |
| Famotidine | 26 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$661 across 25 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
- 2015-06-04
- Last updated
- 2024-11-11
- Certified
- 2024-11-11
Frequently asked questions
- What is Michael Massaro's NPI number?
- Michael Massaro's National Provider Identifier (NPI) is 1558741447, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Massaro's specialty?
- Michael Massaro is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Massaro located?
- Michael Massaro's practice location on file with NPPES is 6555 Coyle Ave Ste 390, Carmichael, CA 95608-0302.
- What is Michael Massaro's phone number?
- The practice phone number listed in the NPPES registry for Michael Massaro is (916) 536-2596.
- Does Michael Massaro accept Medicare?
- Michael Massaro is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Massaro's NPI active?
- Yes — Michael Massaro's NPI (1558741447) is active in the NPPES registry as of the last update on 2024-11-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.