Kathryn Ruth Larson, C-NP
Maternal & Fetal Medicine Physician · Rowley, MA
Kathryn Ruth Larson, C-NP is a maternal & fetal medicine physician with a practice address in Rowley, Massachusetts, and NPI 1487131579, issued on Jul 23, 2018. Check the license (Massachusetts RN266384, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Kathryn Ruth Larson
- Credential
- C-NP
- Primary taxonomy
- Maternal & Fetal Medicine Physician 207VM0101X
- License number
- RN266384 MA
Self-reported in NPPES; status is on the state search - Practice location
- 414 Haverhill St, Rowley, MA 01969
- Phone
- (877) 379-5522
- Enumerated
- Jul 23, 2018
- Record last updated
- Jan 27, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest maternal & fetal medicine physician records → All 92 in Massachusetts → Look up another NPI →
Also registered at 414 Haverhill St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Leanne Roberts, N.P.Family Medicine Physician1184650012
Verify Kathryn Ruth Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license RN266384Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $36.49
2 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 784 providers of this specialty with any payment received $1,252.61 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.
Kathryn Ruth Larson among 92 maternal & fetal medicine physician records in Massachusetts
Kathryn Ruth Larson, C-NP is one of 92 maternal & fetal medicine physician records with a practice address in Massachusetts. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 88% of them.
- NPI issued2018 · 88% of these records are older, 8% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileNo · 82% of these records are
- Record last updated2020 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1 maternal & fetal medicine physician record lists a practice address in Rowley
They are 1 of the 79 NPPES records with a practice address in Rowley, and 92 maternal & fetal medicine physician records in Massachusetts.
All 92 in Massachusetts → Every provider in Rowley → Maternal & Fetal Medicine Physician nationwide →
The 8 maternal & fetal medicine physician records with the nearest ZIP codes
- Linda Kleeman, MDBeverly, MA 019151154442283
- Lucy Bayer, M.D.Norwood, MA 020621376538355
- Dorothy Beazley, M.D.Boston, MA 021111811070279
- Curtis Cetrulo, M.D.Boston, MA 021111427087881
- Sabrina Craigo, M.D.Boston, MA 021111689640674
- Courtney Hargreaves, MDBoston, MA 021111346826104
- Michael House, M.D.Boston, MA 021111851405740
- Ingrid Liff, MDBoston, MA 021111972840510
Common questions
What is Kathryn Ruth Larson, C-NP's NPI number?
Kathryn Ruth Larson, C-NP's National Provider Identifier (NPI) is 1487131579, issued on Jul 23, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Ruth Larson, C-NP located?
The NPPES record lists a practice address at 414 Haverhill St, Rowley, MA, 01969. Phone: (877) 379-5522. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Ruth Larson, C-NP's license?
NPPES lists Massachusetts license number RN266384, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.