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

Onyekachi Joseph Oyiriaru, MD

Individual provider Psychiatry Physician · NPI 1093144875

Onyekachi Joseph Oyiriaru, MD practises Psychiatry in Norristown, Pennsylvania. Qualified in 2002, 24 years ago. Practices with Legacy Treatment Services Inc, a 15-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in Pennsylvania.

Years since qualifying
24
Licensed in
PA
In the registry since
2013
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1201 Dekalb St
Norristown, PA 19401-3415
Phone: (610) 277-7600
Fax: (610) 275-0216
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 556 S. Goddard Blvd., King Of Prussia, PA 19406-1940 — (610) 277-7600
  • 1100 Powell St, Norristown, PA 19401 — (610) 277-4600

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence MD463536 (PA)

Record details

NPI number1093144875
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedNovember 2, 2013
Last updated in NPPESJanuary 8, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolOTHER
Graduated 2002 (24 years in practice)
Group practice Legacy Treatment Services Inc — 15 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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 patients32
Services billed 93 a service is one billed item, such as a visit, a test or a procedure
Average patient age48

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.

Colleagues at Legacy Treatment Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 15 clinicians in the practice; 12 are shown here.

Other providers in Norristown