Sonja Schaffer
NPI 1336694439 · Family Nurse Practitioner · Charlton, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sonja Schaffer is a Family Nurse Practitioner provider in Charlton, MA (NPI 1336694439).
Provider details
- NPI number
- 1336694439
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
- License
- RN2289480 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
146 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 61 | $109 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 49 | $78 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 36 | $111 |
Typical Medicare-allowed amounts for these services range $78–$111 (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 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 222 | 63 |
| Lisinopril | 115 | 34 |
| Amlodipine Besylate | 97 | 27 |
| Levothyroxine Sodium | 93 | 23 |
| Gabapentin | 73 | 12 |
| Hydrochlorothiazide | 66 | 21 |
| Omeprazole | 57 |
Practice location
Mailing address
Additional practice locations (3)
- 9 Trolley Crossing RdCharlton, MA 01507-1351Phone: (508) 784-1278Fax: (508) 784-1279
- 128 Main StSturbridge, MA 01566-1556Phone: (508) 347-9240
- 128 Main StSturbridge, MA 01566-1556Phone: (508) 347-9240
Registry dates
- Enumerated
- 2016-08-18
- Last updated
- 2018-05-07
Frequently asked questions
- What is Sonja Schaffer's NPI number?
- Sonja Schaffer's National Provider Identifier (NPI) is 1336694439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sonja Schaffer's specialty?
- Sonja Schaffer is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Sonja Schaffer located?
- Sonja Schaffer's practice location on file with NPPES is 9 Trolley Crossing Rd, Charlton, MA 01507-1351.
- What is Sonja Schaffer's phone number?
- The practice phone number listed in the NPPES registry for Sonja Schaffer is (508) 784-1278.
- Does Sonja Schaffer accept Medicare?
- Sonja Schaffer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sonja Schaffer's NPI active?
- Yes — Sonja Schaffer's NPI (1336694439) is active in the NPPES registry as of the last update on 2018-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.