Siamak Milanchi, M.D.
Colon & Rectal Surgery Physician · Irvine, CA
Siamak Milanchi, M.D. is a colon & rectal surgery physician with a practice address in Irvine, California, and NPI 1083829956, issued on May 13, 2007. Check the license (California A92723, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Siamak Milanchi
- Credential
- M.D.
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- A92723 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16300 Sand Canyon Ave Ste 604, Irvine, CA 92618
- Phone
- (949) 429-0268
- Enumerated
- May 13, 2007
- Record last updated
- Oct 22, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (949) 420-2180
- Medicare enrollment
- Enrolled (PECOS I20090807000125); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Verify Siamak Milanchi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A92723Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average colon & rectal surgery physician in 2024
110 Medicare Part D claims for 60 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 13 claims were for opioids.
Most prescribed
- Gavilyte-G33 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.
Industry payments in 2024: $33.45
1 payment: food and beverage; the largest payer was Baxter Healthcare. The 1,524 providers of this specialty with any payment received $3,468.16 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.
Colon & Rectal Surgery Physician providers in California
There are 198 colon & rectal surgery physician records in California.
Other colon & rectal surgery physician records in California
- Kenneth Aaron, M.D.Newport Beach, CA1689809162
- Benjamin Abbadessa, M.D.San Diego, CA1255593612
- Michael Abel, M.D.San Francisco, CA1447253380
- Piyush Aggarwal, MDWalnut Creek, CA1700070273
- Allison Aka, MDLoma Linda, CA1891130100
- Gabriel Akopian, M.D.Pasadena, CA1326074535
- Ahmed Alkoraishi, MDHayward, CA1609954478
- Robert Allen, MDSanta Cruz, CA1871586610
- John Anane-Sefah, M.D.Capitola, CA1639227143
- George Angelos, M.D.Redding, CA1548410657
Common questions
What is Siamak Milanchi, M.D.'s NPI number?
Siamak Milanchi, M.D.'s National Provider Identifier (NPI) is 1083829956, issued on May 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Siamak Milanchi, M.D. located?
The NPPES record lists a practice address at 16300 Sand Canyon Ave Ste 604, Irvine, CA, 92618. Phone: (949) 429-0268. Providers update this record themselves, so call before visiting.
How can I verify Siamak Milanchi, M.D.'s license?
NPPES lists California license number A92723, 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 Siamak Milanchi, M.D. prescribe under Medicare Part D?
In 2024, Siamak Milanchi, M.D. had 110 Medicare Part D claims for 60 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions 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. 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.