Mary Njonjo, NP-C
NPI 1245400142 · Adult Health Nurse Practitioner · Lynn, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Njonjo, NP-C is a Adult Health Nurse Practitioner provider in Lynn, MA (NPI 1245400142).
Provider details
- NPI number
- 1245400142
- Entity type
- Individual
- Primary specialty
- Adult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- 237709 (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
18 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
255 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 Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 221 | $70 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 34 | $44 |
Typical Medicare-allowed amounts for these services range $44–$70 (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 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 83 | — |
| Baclofen | 61 | — |
| Atorvastatin Calcium | 59 | 11 |
| Lactulose | 48 | — |
| Lorazepam | 42 | 12 |
| Gabapentin | 38 | — |
| Divalproex Sodium | 36 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-03-06
- Last updated
- 2008-03-06
Frequently asked questions
- What is Mary Njonjo's NPI number?
- Mary Njonjo's National Provider Identifier (NPI) is 1245400142, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Njonjo's specialty?
- Mary Njonjo is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Njonjo located?
- Mary Njonjo's practice location on file with NPPES is 500 Lynnfield St, Lynn, MA 01904-1424.
- What is Mary Njonjo's phone number?
- The practice phone number listed in the NPPES registry for Mary Njonjo is (781) 477-3225.
- Does Mary Njonjo accept Medicare?
- Mary Njonjo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Njonjo's NPI active?
- Yes — Mary Njonjo's NPI (1245400142) is active in the NPPES registry as of the last update on 2008-03-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.