Karen Dasilva, M.D.
NPI 1851364889 · Internal Medicine Physician · Chelmsford, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Dasilva, M.D. is a Internal Medicine Physician provider in Chelmsford, MA (NPI 1851364889).
Provider details
- NPI number
- 1851364889
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 78527 (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 tenure28% of score
20 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
15 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 15 | $9 |
Typical Medicare-allowed amounts for these services range $9–$9 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 65 | 33 |
| Lorazepam | 53 | 31 |
| Atorvastatin Calcium | 48 | 17 |
| Sertraline Hcl | 42 | 20 |
| Oxycodone Hcl | 31 | 19 |
| Metoprolol Succinate | 28 | 12 |
| Citalopram Hydrobromide |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-09
- Last updated
- 2021-09-20
- Certified
- 2021-09-20
Frequently asked questions
- What is Karen Dasilva's NPI number?
- Karen Dasilva's National Provider Identifier (NPI) is 1851364889, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Dasilva's specialty?
- Karen Dasilva is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Dasilva located?
- Karen Dasilva's practice location on file with NPPES is 228 Billerica Rd, Chelmsford, MA 01824-3604.
- What is Karen Dasilva's phone number?
- The practice phone number listed in the NPPES registry for Karen Dasilva is (978) 250-6100.
- Does Karen Dasilva accept Medicare?
- Karen Dasilva is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Dasilva's NPI active?
- Yes — Karen Dasilva's NPI (1851364889) is active in the NPPES registry as of the last update on 2021-09-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.