Claes Nilsson, MD
NPI 1912006065 · Internal Medicine Physician · Dedham, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Claes Nilsson, MD is a Internal Medicine Physician provider in Dedham, MA (NPI 1912006065).
Provider details
- NPI number
- 1912006065
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 53091 (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
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
839 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) |
|---|---|---|
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 427 | $77 |
| Residence Visit for Established Patient With Low Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99348 | 209 | $80 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 85 | $110 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 44 | $133 |
| Initial Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 35 Minutes99305 | 28 | $138 |
| Residence Visit for Established Patient With Straightforward Medical Decision Making, Per Day, If Using Time, at Least 15 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 236 | — |
| Atorvastatin Calcium | 198 | 11 |
| Levothyroxine Sodium | 97 | — |
| Citalopram Hydrobromidebrand: Citalopram Hbr | 83 | — |
| Metoprolol Succinate | 80 | — |
| Trazodone Hcl | 79 | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2022-10-19
- Certified
- 2022-10-18
Frequently asked questions
- What is Claes Nilsson's NPI number?
- Claes Nilsson's National Provider Identifier (NPI) is 1912006065, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claes Nilsson's specialty?
- Claes Nilsson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Claes Nilsson located?
- Claes Nilsson's practice location on file with NPPES is 990 Washington St, Dedham, MA 02026-6714.
- What is Claes Nilsson's phone number?
- The practice phone number listed in the NPPES registry for Claes Nilsson is (413) 543-6820.
- Does Claes Nilsson accept Medicare?
- Claes Nilsson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Claes Nilsson's NPI active?
- Yes — Claes Nilsson's NPI (1912006065) is active in the NPPES registry as of the last update on 2022-10-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.