NPPES file of Aug 9, 2026

Guy S. Diamond, PH.D.

Clinical Psychologist · Philadelphia, PA

Guy S. Diamond, PH.D. is a clinical psychologist with a practice address in Philadelphia, Pennsylvania, and NPI 1801902630, issued on Aug 22, 2006. Check the license (Pennsylvania PS007435L, as entered in NPPES) with the Pennsylvania 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
1801902630
Name
Guy S. Diamond
Credential
PH.D.
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
PS007435L PA
Self-reported in NPPES; status is on the state search
Practice location
3440 Market St, Philadelphia, PA 19104
Phone
(215) 590-7555
Enumerated
Aug 22, 2006
Record last updated
Sep 4, 2012 (not updated in 14 years: call before relying on the address or phone)
Fax
(215) 590-7387
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 clinical psychologist records → All 2,597 in Pennsylvania → Look up another NPI →

Also registered at 3440 Market St

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

  1. Rebecca Aspden, MDChild & Adolescent Psychiatry Physician1417176686
  2. Rossana Avelino, M.D.Child & Adolescent Psychiatry Physician1457464489
  3. Tami Benton, M.D.Child & Adolescent Psychiatry Physician1023118171
  4. Karin Borgmann-Winter, M.D.Child & Adolescent Psychiatry Physician1477666378
  5. Rhonda Boyd, PH.D.Clinical Psychologist1922113497
  6. Angela Clarke, PH.D.Psychologist1801901384

Verify Guy S. Diamond in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Pennsylvania board licenses this profession
    Search for license PS007435L    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 Pennsylvania license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Guy S. Diamond among 2,597 clinical psychologist records in Pennsylvania

Guy S. Diamond, PH.D. is one of 2,597 clinical psychologist records with a practice address in Pennsylvania. 15% 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, 71% newer
  • In a Medicare fileNo · 15% of these records are
  • In the CMS Doctors and Clinicians fileNo · 27% of these records are
  • Record last updated2012 · 65% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

532 clinical psychologist records list a practice address in Philadelphia

They are 532 of the 42,849 NPPES records with a practice address in Philadelphia, and 2,597 clinical psychologist records in Pennsylvania. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 2,597 in Pennsylvania → Every provider in Philadelphia → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. Melissa Alderfer, PH.D.Philadelphia, PA 191041356454607
  2. Jacques Barber, PHDPhiladelphia, PA 191041013932037
  3. Diane Bloch, PH.D.Philadelphia, PA 191041629080551
  4. Rhonda Boyd, PH.D.Philadelphia, PA 191041922113497
  5. Nina Chychula, RN, CRNPPhiladelphia, PA 191041407969793
  6. Frances Cole, PHDPhiladelphia, PA 191041902903958
  7. Susan Delmaestro, PH.D.Philadelphia, PA 191041730284084
  8. Ricardo Eiraldi, PH.D.Philadelphia, PA 191041578679163

Common questions

What is Guy S. Diamond, PH.D.'s NPI number?

Guy S. Diamond, PH.D.'s National Provider Identifier (NPI) is 1801902630, issued on Aug 22, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Guy S. Diamond, PH.D. located?

The NPPES record lists a practice address at 3440 Market St, Philadelphia, PA, 19104. Phone: (215) 590-7555. Providers update this record themselves, so call before visiting.

How can I verify Guy S. Diamond, PH.D.'s license?

NPPES lists Pennsylvania license number PS007435L, as entered by the provider. Search the Pennsylvania 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.