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

MS. Diane Catharine Darcy, MS, RD, LDN

Individual provider Registered Dietitian · NPI 1336449420

MS. Diane Catharine Darcy, MS, RD, LDN is a Registered Dietitian in Rockville, Maryland. Practices as a sole proprietor. Licensed in Maryland.

Licensed in
MD
In the registry since
2010
What do these letters mean?
MS — Master of Science
A graduate science degree.
RD — Registered Dietitian
A credentialed nutrition professional.
LDN — Licensed Dietitian Nutritionist
A state-licensed dietitian nutritionist.

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Practice location Address checks out

15825 Shady Grove Rd Ste 140
Rockville, MD 20850-4008 Not confirmed with CMS for 12 years — call before visiting
Phone: (301) 869-9776
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Registered Dietitian (primary) Taxonomy 133V00000X · Licence D01479 (MD)

Record details

NPI number1336449420
Entity typeIndividual (Type 1)
GenderFemale
Credentials MS , RD , LDN
Sole proprietorYes
NPI enumeratedOctober 24, 2010
Last updated in NPPESJune 25, 2014

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients19
Services billed 69 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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