Richard Ashworth Duff, D.C.
Chiropractor · San Francisco, CA
Richard Ashworth Duff, D.C. is a chiropractor with a practice address in San Francisco, California, and NPI 1124159918, issued on Mar 7, 2007. Check the license (California DC20576, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Richard Ashworth Duff
- Credential
- D.C.
- Primary taxonomy
- Chiropractor 111N00000X
- License number
- DC20576 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2001 Union St, San Francisco, CA 94123
- Phone
- (415) 563-0603
- Enumerated
- Mar 7, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 563-1110
- Entity
- Type 1 · individual
Also registered at 2001 Union St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Laurelyn Borst, RDHDental Hygienist1588879688
- Cynthia Brattesani, DDSGeneral Practice Dentistry1396761888
- Douglas Chenin, DDSGeneral Practice Dentistry1699136010
- Alexander ChukreeffGeneral Practice Dentistry1376947853
- Poriya Dokhanchi, DDSGeneral Practice Dentistry1417003740
Verify Richard Ashworth Duff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license DC20576Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Chiropractor providers in California
There are 11,498 chiropractor records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 11,498 in California → Every provider in San Francisco →
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Common questions
What is Richard Ashworth Duff, D.C.'s NPI number?
Richard Ashworth Duff, D.C.'s National Provider Identifier (NPI) is 1124159918, issued on Mar 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Richard Ashworth Duff, D.C. located?
The NPPES record lists a practice address at 2001 Union St, San Francisco, CA, 94123. Phone: (415) 563-0603. Providers update this record themselves, so call before visiting.
How can I verify Richard Ashworth Duff, D.C.'s license?
NPPES lists California license number DC20576, as entered by the provider. Search the California 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.
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.