Ian Charles Duncan, MD
Orthopaedic Surgery Physician · Visalia, CA
Ian Charles Duncan, MD is an orthopaedic surgery physician with a practice address in Visalia, California, and NPI 1982866927, issued on Jul 1, 2008. Check the license (California A120183, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ian Charles Duncan
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- A120183 CA
Self-reported in NPPES; status is on the state search - Practice location
- 820 S Akers, Visalia, CA 93277
- Phone
- (559) 733-3346
- Enumerated
- Jul 1, 2008
- Record last updated
- Nov 7, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (559) 733-5059
- Medicare enrollment
- Enrolled (PECOS I20120827000660); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 820 S Akers
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Burton Redd, MDOrthopaedic Surgery Physician1437269206
- Donald Schengel, MDOrthopaedic Surgery Physician1376645895
Verify Ian Charles Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A120183Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% more Medicare Part D claims than the average orthopaedic surgery physician in 2024
551 Medicare Part D claims for 244 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 182 claims were for opioids.
Most prescribed
- Meloxicam274 claims
- Tramadol Hcl72 claims
- Oxycodone-Acetaminophen66 claims
- Hydrocodone-Acetaminophen31 claims
- Amoxicillin-Clavulanate Potass29 claims
- Celecoxib16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.5 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.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,076.65
15 payments; by number, the most common kind was food and beverage; the largest payer was Zimmer Biomet Holdings, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Orthopaedic Assoc Medical Clinic IncVisalia, CA
- Sequoia Multispecialty Medical GroupVisalia, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ian Charles Duncan among 2,276 orthopaedic surgery physician records in California
Ian Charles Duncan, MD is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 65% of them.
- NPI issued2008 · 65% of these records are older, 31% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2006 · median 2003 among the 1,347 with a school on file
- Record last updated2014 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.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 Visalia → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Seth Criner, D.O.Visalia, CA 932771972824100
- Bruce Le, DO, MSVisalia, CA 932771558465799
- Burton Redd, MDVisalia, CA 932771437269206
- Donald Schengel, MDVisalia, CA 932771376645895
- Timothy Tan, M.D.Visalia, CA 932771023404910
- Jou Lee, MDTulare, CA 932741316965684
- Frank Feng, DOVisalia, CA 932911730281254
- James Guadagni, M.D.Visalia, CA 932911013913664
Common questions
What is Ian Charles Duncan, MD's NPI number?
Ian Charles Duncan, MD's National Provider Identifier (NPI) is 1982866927, issued on Jul 1, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Ian Charles Duncan, MD located?
The NPPES record lists a practice address at 820 S Akers, Visalia, CA, 93277. Phone: (559) 733-3346. Providers update this record themselves, so call before visiting.
How can I verify Ian Charles Duncan, MD's license?
NPPES lists California license number A120183, 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.
How much does Ian Charles Duncan, MD prescribe under Medicare Part D?
In 2024, Ian Charles Duncan, MD had 551 Medicare Part D claims for 244 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
What is Ian Charles Duncan, MD's MIPS final score?
The 2023 MIPS final score is 79.5 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.
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.