NPPES file of Aug 9, 2026

Mark A. Riddle, M.D.

Child & Adolescent Psychiatry Physician · Columbia, MD

Mark A. Riddle, M.D. is a child & adolescent psychiatry physician with a practice address in Columbia, Maryland, and NPI 1316989304, issued on Jun 12, 2006. Check the license (Maryland D0045696, as entered in NPPES) on the Maryland Board of Physicians; 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
1316989304
Name
Mark A. Riddle
Credential
M.D.
Primary taxonomy
Child & Adolescent Psychiatry Physician 2084P0804X
License number
D0045696 MD
Self-reported in NPPES; status is on the state search
Practice location
5500 Knoll North Dr Ste 370, Columbia, MD 21045
Phone
(410) 837-2050
Enumerated
Jun 12, 2006
Record last updated
Jul 21, 2022
Fax
(866) 629-0091
Medicaid ID
162501200 MD
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 child & adolescent psychiatry physician records → All 257 in Maryland → Look up another NPI →

Also registered at 5500 Knoll North Dr Ste 370

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

  1. Fadi Abdallah, LCSW-CClinical Social Worker1881620573
  2. Tricia Alexis, FNPFamily Nurse Practitioner1285973883
  3. Carmen Alvarez, NP-C, CNMFamily Nurse Practitioner1396925723
  4. Shemicka Asom, CRNPFamily Nurse Practitioner1982025375
  5. William Brown, LCSW-CClinical Social Worker1508139445
  6. Jillian Clark, LCSW-CClinical Social Worker1962173880

Verify Mark A. Riddle in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMaryland Board of Physicians
    Search for license D0045696    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
Open the Maryland license search

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Mark A. Riddle among 257 child & adolescent psychiatry physician records in Maryland

Mark A. Riddle, M.D. is one of 257 child & adolescent psychiatry physician records with a practice address in Maryland. 51% 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 2006, is newer than 4% of them.

  • NPI issued2006 · 4% of these records are older, 74% newer
  • In a Medicare fileNo · 51% of these records are
  • In the CMS Doctors and Clinicians fileNo · 22% of these records are
  • Record last updated2022 · 67% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0804X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Child & Adolescent Psychiatry Physician providers in Maryland

There are 257 child & adolescent psychiatry physician records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 257 in Maryland → Every provider in Columbia → Child & Adolescent Psychiatry Physician nationwide →

The 8 child & adolescent psychiatry physician records with the nearest ZIP codes

  1. Patricia Assan, M.D.Columbia, MD 210451114086972
  2. Peter Cohen, M.D.Columbia, MD 210451033118617
  3. Valerie Shell, MDColumbia, MD 210451033267257
  4. Anita Bajaj, MDColumbia, MD 210461699938217
  5. Phyllis Heffner, M.D.Columbia, MD 210441083614424
  6. Suni Jani, M.D., M.P.H.Columbia, MD 210441053671313
  7. Sushma Jani, MDColumbia, MD 210441225095714
  8. Tolulope Omojokun, MDColumbia, MD 210461083145338

Common questions

What is Mark A. Riddle, M.D.'s NPI number?

Mark A. Riddle, M.D.'s National Provider Identifier (NPI) is 1316989304, issued on Jun 12, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Mark A. Riddle, M.D. located?

The NPPES record lists a practice address at 5500 Knoll North Dr Ste 370, Columbia, MD, 21045. Phone: (410) 837-2050. Providers update this record themselves, so call before visiting.

How can I verify Mark A. Riddle, M.D.'s license?

NPPES lists Maryland license number D0045696, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

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.