Walter Mutter, M.D.
NPI 1104895556 · Nephrology Physician · Newton, MA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Mutter, M.D. is a Nephrology Physician provider in Newton, MA (NPI 1104895556).
Provider details
- NPI number
- 1104895556
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 210130 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2,275 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 | 599 | $139 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 549 | $17 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 296 | $82 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 224 | $99 |
| Dialysis Services, 1 Physician Visit Per Month (20 Years Or Older)90962 | 135 | $215 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Losartan Potassium | 125 | 38 |
| Amlodipine Besylate | 101 | 33 |
| Lisinopril | 99 | 34 |
| Torsemide | 83 | 26 |
| Hydrochlorothiazide | 68 | 22 |
| Potassium Citratebrand: Potassium Citrate Er | 48 | 21 |
| Potassium Chloride | 37 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$60 across 5 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
- 2006-03-17
- Last updated
- 2016-05-06
Frequently asked questions
- What is Walter Mutter's NPI number?
- Walter Mutter's National Provider Identifier (NPI) is 1104895556, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Mutter's specialty?
- Walter Mutter is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Mutter located?
- Walter Mutter's practice location on file with NPPES is Newton Wellesley Physicians Nephrology, Newton, MA 20462.
- What is Walter Mutter's phone number?
- The practice phone number listed in the NPPES registry for Walter Mutter is (617) 243-5420.
- Does Walter Mutter accept Medicare?
- Walter Mutter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Mutter's NPI active?
- Yes — Walter Mutter's NPI (1104895556) is active in the NPPES registry as of the last update on 2016-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.