NPPES file of Aug 9, 2026

Mark Timothy Sweeney, PH.D., LPC

Professional Counselor · Washington, DC

Mark Timothy Sweeney, PH.D., LPC is a professional counselor with a practice address in Washington, District of Columbia, and NPI 1205167038, issued on Jan 18, 2010. Check the license (District of Columbia PRC13878, as entered in NPPES) with the District of Columbia board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1205167038
Name
Mark Timothy Sweeney
Credential
PH.D., LPC
Primary taxonomy
Professional Counselor 101YP2500X
License number
PRC13878 DC
Self-reported in NPPES; status is on the state search
Practice location
1253 Walter St SE, Washington, DC 20003
Phone
(202) 596-5951
Enumerated
Jan 18, 2010
Record last updated
Jan 18, 2010 (not updated in 16 years: call before relying on the address or phone)
Fax
(866) 712-1080
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest professional counselor records → All 615 in District of Columbia → Look up another NPI →

Also registered at 1253 Walter St SE

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Karis Callahan, MSW, LICSWClinical Social Worker1730324286
  2. Odyssey HinesSocial Worker1144742149
  3. Crista Kostenko, ATRArt Therapist1114215720
  4. Crystal Marcus, M.A.Counselor1356715833
  5. Andrew MitchellSocial Worker1316391865
  6. Brittany Phipps, MFTMarriage & Family Therapist1477000982

Verify Mark Timothy Sweeney in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich District of Columbia board licenses this profession
    Search for license PRC13878    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the District of Columbia license search

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Mark Timothy Sweeney among 615 professional counselor records in District of Columbia

Mark Timothy Sweeney, PH.D., LPC is one of 615 professional counselor records with a practice address in District of Columbia. 7% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2010, is newer than 16% of them.

  • NPI issued2010 · 16% of these records are older, 80% newer
  • In a Medicare fileNo · 7% of these records are
  • In the CMS Doctors and Clinicians fileNo · 12% of these records are
  • Record last updated2010 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 101YP2500X and a District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

611 professional counselor records list a practice address in Washington

They are 611 of the 45,857 NPPES records with a practice address in Washington, and 615 professional counselor records in District of Columbia. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 615 in District of Columbia → Every provider in Washington → Professional Counselor nationwide →

The 8 professional counselor records with the nearest ZIP codes

  1. Veronica Bradford, LPCWashington, DC 200031922261775
  2. Squire Daniels, LPCWashington, DC 200031982913471
  3. Famebridge Gray, LPCWashington, DC 200031417192865
  4. Nilfa Guzman, LPCWashington, DC 200031851514483
  5. Sandy Kilada, LPCWashington, DC 200031700130382
  6. Heather Lively, LPCWashington, DC 200031871815001
  7. John Ndambuki, LPC, LCPCWashington, DC 200031538478656
  8. Dale Ostrander, M.DIV., LPCWashington, DC 200031194912089

Common questions

What is Mark Timothy Sweeney, PH.D., LPC's NPI number?

Mark Timothy Sweeney, PH.D., LPC's National Provider Identifier (NPI) is 1205167038, issued on Jan 18, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Mark Timothy Sweeney, PH.D., LPC located?

The NPPES record lists a practice address at 1253 Walter St SE, Washington, DC, 20003. Phone: (202) 596-5951. Providers update this record themselves, so call before visiting.

How can I verify Mark Timothy Sweeney, PH.D., LPC's license?

NPPES lists District of Columbia license number PRC13878, as entered by the provider. Search the District of Columbia board that licenses this profession; the NPPES record confirms identity 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.