William Belcastro, M.D.
NPI 1548269251 · Internal Medicine Physician · Springfield, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Belcastro, M.D. is a Internal Medicine Physician provider in Springfield, MA (NPI 1548269251).
Provider details
- NPI number
- 1548269251
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 37640 (MA)
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
20 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
3,205 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 | 411 | $130 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 253 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 162 | $8 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 150 | $13 |
| Ldl Cholesterol Level83721 | 150 | $10 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation, High Sensitivity86141 | 141 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 68 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 417 | 103 |
| Losartan Potassium | 281 | 78 |
| Amlodipine Besylate | 225 | 62 |
| Metoprolol Succinate | 190 | 54 |
| Hydrochlorothiazide | 184 | 58 |
| Lisinopril | 176 | 47 |
| Levothyroxine Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$34 across 2 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
- 2005-07-15
- Last updated
- 2012-11-16
Frequently asked questions
- What is William Belcastro's NPI number?
- William Belcastro's National Provider Identifier (NPI) is 1548269251, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Belcastro's specialty?
- William Belcastro is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Belcastro located?
- William Belcastro's practice location on file with NPPES is 299 Carew St, Springfield, MA 01104-2301.
- What is William Belcastro's phone number?
- The practice phone number listed in the NPPES registry for William Belcastro is (413) 737-2371.
- Does William Belcastro accept Medicare?
- William Belcastro is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Belcastro's NPI active?
- Yes — William Belcastro's NPI (1548269251) is active in the NPPES registry as of the last update on 2012-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.