Mary Njonjo, NP-C
Adult Health Nurse Practitioner · Lynn, MA
Mary Njonjo, NP-C is an adult health nurse practitioner with a practice address in Lynn, Massachusetts, and NPI 1245400142, issued on Mar 6, 2008. Check the license (Massachusetts 237709, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Njonjo
- Credential
- NP-C
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License number
- 237709 MA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Lynnfield St, Lynn, MA 01904
- Phone
- (781) 477-3225
- Enumerated
- Mar 6, 2008
- Record last updated
- Mar 6, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140709002190); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 1,465 in Massachusetts → Look up another NPI →
Also registered at 500 Lynnfield St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Njonjo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 237709Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average adult health nurse practitioner in 2024
1,406 Medicare Part D claims for 95 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Levothyroxine Sodium83 claims
- Baclofen61 claims
- Atorvastatin Calcium59 claims
- Lactulose48 claims
- Lorazepam42 claims
- Gabapentin38 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 3 group practices
- Charter Health PCSalem, MA
- Charter Ltc LLCSalem, MA
- The Commonwealth OF MassachusettsTewksbury, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Njonjo among 1,465 adult health nurse practitioner records in Massachusetts
Mary Njonjo, NP-C is one of 1,465 adult health nurse practitioner records with a practice address in Massachusetts. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 44% of them.
- NPI issued2008 · 44% of these records are older, 50% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2007 · median 2010 among the 634 with a school on file
- Record last updated2008 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Health Nurse Practitioner providers in Massachusetts
There are 1,465 adult health nurse practitioner records in Massachusetts.
All 1,465 in Massachusetts → Every provider in Lynn → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Sarah Hillios, ANP-CLynn, MA 019041154637882
- Debra Sylvester, DNP, APCLynn, MA 019041659329662
- Lisa Aptt, CNPLynn, MA 019021073158614
- Leslie Breen, ADULT NPLynn, MA 019021174702047
- Stephanie Dimasi, AGNP-BCSaugus, MA 019061851786172
- Constance Mills, NPLynn, MA 019021770684433
- Whitney Hong, N.P.Lynn, MA 019011093041543
- Kathryn Takayoshi, NPLynn, MA 019011669758306
Common questions
What is Mary Njonjo, NP-C's NPI number?
Mary Njonjo, NP-C's National Provider Identifier (NPI) is 1245400142, issued on Mar 6, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary Njonjo, NP-C located?
The NPPES record lists a practice address at 500 Lynnfield St, Lynn, MA, 01904. Phone: (781) 477-3225. Providers update this record themselves, so call before visiting.
How can I verify Mary Njonjo, NP-C's license?
NPPES lists Massachusetts license number 237709, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Njonjo, NP-C prescribe under Medicare Part D?
In 2024, Mary Njonjo, NP-C had 1,406 Medicare Part D claims for 95 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.