DR. GUILLERMO ALFREDO WALTERS (M.D.) – Diagnostic Radiology Physician, NPI 1558351494
Diagnostic Radiology Physician
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NPPES metrics only — not quality of care.
1,952 DIAGNOSTIC RADIOLOGY in MA
Provider Addresses for DR. GUILLERMO ALFREDO WALTERS (M.D.)
55 Lake Ave N
Worcester, MA 016550002
Phone: (508) 334-3850
Fax: (508) 856-1860
Type: Location
9, Jackson Drive, Acton, Middlesex County, Massachusetts, 01720, United States
ACTON, MA 017203108
Phone: (978) 635-5333
Type: Mailing
PO BOX 415348
BOSTON, MA 022415348
Phone: (800) 225-8885
Fax: (508) 334-1977
Type: Mailing
Umass Memorial-Healthalliance Hospital, 60, Hospital Road, West Leominster, Leominster, Worcester County, Massachusetts, 01453, United States
LEOMINSTER, MA 014532205
Phone: (978) 466-2714
Fax: (978) 466-2746
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-09-07
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050907000432 | I | Diagnostic Radiology | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 70553 | Mri scan of brain before and after contrast | 116 | 115 | $0 |
| 77067 | Screening mammography | 104 | 104 | $0 |
| 20610 | Aspiration and/or injection of fluid from large joint | 97 | 77 | $0 |
| 77002 | Fluoroscopic guidance for needle placement | 91 | 80 | $0 |
| 76536 | Ultrasound scan of head and neck soft tissue | 89 | 89 | $0 |
Insurance plans in this area (ZIP 01655)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| DIAGNOSTIC RADIOLOGY | MA | 71010 | X-ray of chest, 1 view, front | 455 | 293 |
| DIAGNOSTIC RADIOLOGY | MA | 74177 | CT scan of abdomen and pelvis with contrast | 158 | 151 |
| DIAGNOSTIC RADIOLOGY | MA | 76830 | Ultrasound pelvis through vagina | 31 | 31 |
| DIAGNOSTIC RADIOLOGY | MA | 93971 | Ultrasound scan of veins of one arm or leg or limited including assessment of compression and functional maneuvers | 68 | 67 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | MA | |
| - | MA | |
| - | MA | |
| Family Practice | MA | |
| Physician Assistant | MA | |
| Pulmonary Disease, Critical Care (Intensivists), Allergy/Immunology | MA | |
| - | MA | |
| - | MA | |
| Internal Medicine | MA | |
| Nurse Practitioner | MA |
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