NPPES file of Aug 9, 2026

Richard C. Diehl, M.D.

Orthopaedic Surgery Physician · Pasadena, CA

Richard C. Diehl, M.D. is an orthopaedic surgery physician with a practice address in Pasadena, California, and NPI 1417943127, issued on Sep 27, 2005. Check the license (California G15733, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2023 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1417943127
Name
Richard C. Diehl
Credential
M.D.
Primary taxonomy
Orthopaedic Surgery Physician 207X00000X
License number
G15733 CA
Self-reported in NPPES; status is on the state search
Practice location
800 S Raymond Ave, Pasadena, CA 91105
Phone
(626) 795-8051
Enumerated
Sep 27, 2005
Record last updated
Jan 26, 2009 (not updated in 17 years: call before relying on the address or phone)
Fax
(626) 795-0356
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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Also registered at 800 S Raymond Ave

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

  1. Gregory Adamson, M.D.Sports Medicine (Orthopaedic Surgery) Physician1972590610
  2. Lea Armendariz, PTPhysical Therapist1427327147
  3. Roy Ashford, M.D.Orthopaedic Surgery of the Spine Physician1588646368
  4. Julie Cann, PA-CPhysician Assistant1972734929
  5. William Costigan, M.D.Orthopaedic Surgery of the Spine Physician1821084641
  6. Todd Dietrick, M.D.Adult Reconstructive Orthopaedic Surgery Physician1619963444

Verify Richard C. Diehl in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G15733    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 California license search

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The practice group's MIPS final score for 2023 (Medicare payment program): 76.6 of 100

The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.

  1. Qualityout of 100 · 30% of the final score77.5
  2. Costout of 100 · 30%44.5
  3. Promoting interoperabilityout of 100 · 25%100.0
  4. Improvement activities40 of 40 points · 15%100.0

Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).

Orthopaedic Surgery Physician providers in California

There are 2,276 orthopaedic surgery physician records in California.

All 2,276 in California → Every provider in Pasadena →

Other orthopaedic surgery physician records in California

  1. Karim Abdollahi, M.D.Laguna Beach, CA1942240403
  2. Michael Abdulian, MDGlendale, CA1649469628
  3. Hussein Abdulrassoul, MDRiverside, CA1972123891
  4. Douglas Abeles, MDCastro Valley, CA1508961582
  5. Anthony Abene, MDSan Jose, CA1457437964
  6. Torgom Abraamyan, M.D.Van Nuys, CA1013370410
  7. Monther AbuhantashSan Francisco, CA1447041512
  8. Joshua Acebo, MDPalo Alto, CA1396373734
  9. Daniel Acevedo, M.D.Thousand Oaks, CA1184856122
  10. John Adams, MDLos Angeles, CA1215914114

Common questions

What is Richard C. Diehl, M.D.'s NPI number?

Richard C. Diehl, M.D.'s National Provider Identifier (NPI) is 1417943127, issued on Sep 27, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Richard C. Diehl, M.D. located?

The NPPES record lists a practice address at 800 S Raymond Ave, Pasadena, CA, 91105. Phone: (626) 795-8051. Providers update this record themselves, so call before visiting.

How can I verify Richard C. Diehl, M.D.'s license?

NPPES lists California license number G15733, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

What is Richard C. Diehl, M.D.'s MIPS final score?

The 2023 MIPS final score is 76.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.