Guillermo Walters, M.D.
NPI 1558351494 · Diagnostic Radiology Physician · Leominster, MA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Walters, M.D. is a Diagnostic Radiology Physician provider in Leominster, MA (NPI 1558351494).
Provider details
- NPI number
- 1558351494
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 74668 (MA)
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,449 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) |
|---|---|---|
| Mri Scan of Brain Before and After Contrast70553 | 148 | $107 |
| Complete Ultrasound Scan Behind Abdominal Cavity76770 | 115 | $35 |
| Mri Scan of Brain Without Contrast70551 | 102 | $69 |
| Mri Scan of Lower Spinal Canal Without Contrast72148 | 99 | $69 |
| Ultrasound Scan of Head and Neck Soft Tissue76536 | 95 | $26 |
| Limited Ultrasound Scan of Abdomen76705 | 90 |
Practice location
Mailing address
Additional practice locations (1)
- 55 Lake Ave NWorcester, MA 01655-0002Phone: (508) 334-3850Fax: (508) 856-1860
Registry dates
- Enumerated
- 2005-10-23
- Last updated
- 2021-06-02
- Certified
- 2021-06-02
Frequently asked questions
- What is Guillermo Walters's NPI number?
- Guillermo Walters's National Provider Identifier (NPI) is 1558351494, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Walters's specialty?
- Guillermo Walters is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Walters located?
- Guillermo Walters's practice location on file with NPPES is 60 Hospital Rd, Leominster, MA 01453-2205.
- What is Guillermo Walters's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Walters is (978) 466-2714.
- Does Guillermo Walters accept Medicare?
- Guillermo Walters is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Walters's NPI active?
- Yes — Guillermo Walters's NPI (1558351494) is active in the NPPES registry as of the last update on 2021-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.