Katherine O'Brien, RD, LDN
Registered Dietitian · Acton, MA
Katherine O'Brien, RD, LDN is a registered dietitian with a practice address in Acton, Massachusetts, and NPI 1588129639, issued on Feb 4, 2019. Check the license (Massachusetts 4418, as entered in NPPES) with the Massachusetts board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Katherine O'Brien
- Credential
- RD, LDN
- Primary taxonomy
- Registered Dietitian 133V00000X
- License number
- 4418 MA
Self-reported in NPPES; status is on the state search - Practice location
- 321 Main St, Acton, MA 01720
- Phone
- (978) 635-8700
- Enumerated
- Feb 4, 2019
- Entity
- Type 1 · individual
Also registered at 321 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Bechtel, NPNurse Practitioner1144578626
- Meryl BergerNurse Practitioner1922600220
- Louis Berk, M.D.Family Medicine Physician1730501875
- Elizabeth Berman, RDN, LDNRegistered Dietitian1679949143
- Christine Brown, M.D.Internal Medicine Physician1588861660
- Samuel BrownClinical Social Worker1336576065
Verify Katherine O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 4418Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
17 registered dietitian records list a Acton practice address
They are 17 of the 556 NPPES records with a Acton practice address, and 2,202 registered dietitian records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17 in Acton → All 2,202 in Massachusetts → Every provider in Acton →
Other registered dietitian records in Massachusetts
- Lynn Abbott, RDBoston, MA1699006601
- Lauren Abeles, RD, RDNNeedham, MA1407621311
- Robin Abourizk, MA, MS, RD, LDNBoston, MA1073846945
- Christine Abrahamian, R.D.Framingham, MA1114149895
- Jenica Abram, MPH, RDN, LDNConcord, MA1891554325
- Jennifer Ackerman, MS, RD, LDN, CDEWinchester, MA1538349097
- Amy Adams, RDBrockton, MA1033976048
- Karin AdamsMarblehead, MA1316531502
- Rachel Adams, RDNMarblehead, MA1770438590
- Sarah Adler, MS RDN LDNBoston, MA1821741489
Common questions
What is Katherine O'Brien, RD, LDN's NPI number?
Katherine O'Brien, RD, LDN's National Provider Identifier (NPI) is 1588129639, issued on Feb 4, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Katherine O'Brien, RD, LDN located?
The NPPES record lists a practice address at 321 Main St, Acton, MA, 01720. Phone: (978) 635-8700. Providers update this record themselves, so call before visiting.
How can I verify Katherine O'Brien, RD, LDN's license?
NPPES lists Massachusetts license number 4418, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.