Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Katherine O'Brien, RD, LDN

Individual provider Registered Dietitian · NPI 1588129639

Katherine O'Brien, RD, LDN is a Registered Dietitian in Acton, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2019
What do these letters mean?
RD — Registered Dietitian
A credentialed nutrition professional.
LDN — Licensed Dietitian Nutritionist
A state-licensed dietitian nutritionist.

See every abbreviation used in this directory →

Practice location Address checks out

321 Main St
Acton, MA 01720-3799
Phone: (978) 635-8700
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Registered Dietitian (primary) Taxonomy 133V00000X · Licence 4418 (MA)

Record details

NPI number1588129639
Entity typeIndividual (Type 1)
GenderFemale
Credentials RD , LDN
Sole proprietorYes
NPI enumeratedFebruary 4, 2019
Last updated in NPPESFebruary 11, 2021
Certification dateFebruary 11, 2021

Other providers in Acton