NPPES file of Aug 9, 2026

Roberto Ivan Diaz, M.D.

Orthopaedic Hand Surgery Physician · Mountain View, CA

Roberto Ivan Diaz, M.D. is an orthopaedic hand surgery physician with a practice address in Mountain View, California, and NPI 1124261110, issued on Apr 7, 2009. Check the license (California A112035, 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 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1124261110
Name
Roberto Ivan Diaz
Credential
M.D.
Primary taxonomy
Orthopaedic Hand Surgery Physician 207XS0106X
License number
A112035 CA
Self-reported in NPPES; status is on the state search
Practice location
701 E EL Camino Real, Mountain View, CA 94040
Phone
(650) 934-7111
Enumerated
Apr 7, 2009
Record last updated
Dec 10, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20141014001069); accepts Medicare assignment
Medical or professional school
University Of Iowa, Rj & L Carver College Of Medicine, 2008
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest orthopaedic hand surgery physician records → All 288 in California → Look up another NPI →

Also registered at 701 E EL Camino Real

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

  1. Aya Abou-Nasr, MDAnesthesiology Physician1982191672
  2. Jaimie Abraham, AGPCNP-BCFamily Nurse Practitioner1245757699
  3. Brooke Abrantes, PA-CSurgical Physician Assistant1316771298
  4. Faud Abuabara, M.D.MOHS-Micrographic Surgery Physician1164472890
  5. Felix Adler, M.D.Diagnostic Radiology Physician1801069729
  6. Olga Afanasiev, MD, PHDDermatology Physician1669869384

Verify Roberto Ivan Diaz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A112035    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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57% fewer Medicare Part D claims than the average orthopaedic hand surgery physician in 2024

80 Medicare Part D claims for 51 beneficiaries, against an average of 186 among the 2,203 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 46 claims were for opioids.

  1. Roberto Diaz80
  2. Specialty average186

Most prescribed

  1. Hydrocodone-Acetaminophen35 claims
  2. Ibuprofen15 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: $220.85

3 payments; by number, the most common kind was food and beverage; the largest payer was Globus Medical, Inc. The 1,819 providers of this specialty with any payment received $5,529.86 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Roberto Diaz$220.85
  2. Specialty average$5,529.86

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Sutter Bay Medical FoundationMountain View, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Roberto Ivan Diaz among 288 orthopaedic hand surgery physician records in California

Roberto Ivan Diaz, M.D. is one of 288 orthopaedic hand surgery physician records with a practice address in California. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 67% of them.

  • NPI issued2009 · 67% of these records are older, 28% newer
  • In a Medicare fileYes · 85% of these records are
  • In the CMS Doctors and Clinicians fileYes · 74% of these records are
  • Graduated2008 · median 2004 among the 214 with a school on file
  • Record last updated2020 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XS0106X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Orthopaedic Hand Surgery Physician providers in California

There are 288 orthopaedic hand surgery physician records in California.

All 288 in California → Every provider in Mountain View → Orthopaedic Hand Surgery Physician nationwide →

The 8 orthopaedic hand surgery physician records with the nearest ZIP codes

  1. Garet Comer, M.D.Mountain View, CA 940401659507804
  2. Anthony Nguyen, M.D.Mountain View, CA 940401558421883
  3. Michael Sathy, M.D.Mountain View, CA 940401275586828
  4. Kareme Alder, MDRedwood City, CA 940631396322210
  5. Gordon Brody, MDRedwood City, CA 940631275563561
  6. Jeffrey Yao, MDRedwood City, CA 940631699821942
  7. Jaret Butler, MDSan Carlos, CA 940701114121860
  8. Scott Liu, MDSan Francisco, CA 941051992334338

Common questions

What is Roberto Ivan Diaz, M.D.'s NPI number?

Roberto Ivan Diaz, M.D.'s National Provider Identifier (NPI) is 1124261110, issued on Apr 7, 2009. An NPI identifies a provider in billing; it is not a license.

Where is Roberto Ivan Diaz, M.D. located?

The NPPES record lists a practice address at 701 E EL Camino Real, Mountain View, CA, 94040. Phone: (650) 934-7111. Providers update this record themselves, so call before visiting.

How can I verify Roberto Ivan Diaz, M.D.'s license?

NPPES lists California license number A112035, 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 Roberto Ivan Diaz, M.D. prescribe under Medicare Part D?

In 2024, Roberto Ivan Diaz, M.D. had 80 Medicare Part D claims for 51 beneficiaries; the average among orthopaedic hand surgery physician prescribers was 186. 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.

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.