Mary Lou Ryan, RNCS
Psychiatric/Mental Health Registered Nurse · Somerville, MA
Mary Lou Ryan, RNCS is a psychiatric/mental health registered nurse with a practice address in Somerville, Massachusetts, and NPI 1578584843, issued on Jul 22, 2006. Check the license (Massachusetts 150000, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Lou Ryan
- Credential
- RNCS
- Primary taxonomy
- Psychiatric/Mental Health Registered Nurse 163WP0808X
- License number
- 150000 MA
Self-reported in NPPES; status is on the state search - Practice location
- 40 Holland St, Somerville, MA 02144
- Phone
- (617) 629-6180
- Enumerated
- Jul 22, 2006
- Record last updated
- Oct 7, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health registered nurse records → All 365 in Massachusetts → Look up another NPI →
Also registered at 40 Holland St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Lou Ryan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 150000Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average psychiatric/mental health registered nurse in 2024
25 Medicare Part D claims for 13 beneficiaries, against an average of 888 among the 242 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $21.86
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 213 providers of this specialty with any payment received $1,316.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mary Lou Ryan among 365 psychiatric/mental health registered nurse records in Massachusetts
Mary Lou Ryan, RNCS is one of 365 psychiatric/mental health registered nurse records with a practice address in Massachusetts. 23% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than under 1% of them.
- NPI issued2006 · under 1% of these records are older, 86% newer
- In a Medicare fileYes · 23% of these records are
- In the CMS Doctors and Clinicians fileNo · 16% of these records are
- Record last updated2010 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 163WP0808X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatric/Mental Health Registered Nurse providers in Massachusetts
There are 365 psychiatric/mental health registered nurse records in Massachusetts.
All 365 in Massachusetts → Every provider in Somerville → Psychiatric/Mental Health Registered Nurse nationwide →
The 8 psychiatric/mental health registered nurse records with the nearest ZIP codes
- Renee Babin, RNSomerville, MA 021431417764564
- Rosemary KeanSomerville, MA 021431619034170
- Michele KlauSomerville, MA 021431629135090
- Kate VitalSomerville, MA 021431467132555
- James Atkins, RNCambridge, MA 021391265660021
- Sarah Dougenik, RNCSCambridge, MA 021391316164296
- Marilyn Fisher, RNCambridge, MA 021391326370164
- Terrin Gathers, RNEverett, MA 021491700504065
Common questions
What is Mary Lou Ryan, RNCS's NPI number?
Mary Lou Ryan, RNCS's National Provider Identifier (NPI) is 1578584843, issued on Jul 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Lou Ryan, RNCS located?
The NPPES record lists a practice address at 40 Holland St, Somerville, MA, 02144. Phone: (617) 629-6180. Providers update this record themselves, so call before visiting.
How can I verify Mary Lou Ryan, RNCS's license?
NPPES lists Massachusetts license number 150000, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Lou Ryan, RNCS prescribe under Medicare Part D?
In 2024, Mary Lou Ryan, RNCS had 25 Medicare Part D claims for 13 beneficiaries; the average among psychiatric/mental health registered nurse prescribers was 888. 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.