Diana Julia Chang, MD
Otolaryngology Physician · Poway, CA
Diana Julia Chang, MD is an otolaryngology physician with a practice address in Poway, California, and NPI 1578143491, issued on Apr 13, 2021. Check the license (California A199082, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diana Julia Chang
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- A199082 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12630 Monte Vista RD Ste 206, Poway, CA 92064
- Phone
- (858) 674-1165
- Enumerated
- Apr 13, 2021
- Record last updated
- Jul 29, 2026
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Verify Diana Julia Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A199082Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average otolaryngology physician in 2024
212 Medicare Part D claims for 99 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. 74 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen52 claims
- Ondansetron Odt51 claims
- Amoxicillin-Clavulanate Potass16 claims
- Oxycodone Hcl11 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.
Diana Julia Chang among 1,212 otolaryngology physician records in California
Diana Julia Chang, MD is one of 1,212 otolaryngology physician records with a practice address in California. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 95% of them.
- NPI issued2021 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2026 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in California
There are 1,212 otolaryngology physician records in California.
All 1,212 in California → Every provider in Poway → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Patrick Fitzgerald, M.D.Poway, CA 920641790882728
- Alison Learn, M.D.Poway, CA 920641477650406
- Jennifer Macewan, M.D.Poway, CA 920641336382019
- George Sachs, MDPoway, CA 920641073770376
- Ashish Wadhwa, MDPoway, CA 920641477595189
- Julie Berry, M.D.Oceanside, CA 920561699724666
- Robert Jacobs, MDOceanside, CA 920561023028446
- Anton Kushnaryov, M.D.Oceanside, CA 920561023246089
Common questions
What is Diana Julia Chang, MD's NPI number?
Diana Julia Chang, MD's National Provider Identifier (NPI) is 1578143491, issued on Apr 13, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Diana Julia Chang, MD located?
The NPPES record lists a practice address at 12630 Monte Vista RD Ste 206, Poway, CA, 92064. Phone: (858) 674-1165. Providers update this record themselves, so call before visiting.
How can I verify Diana Julia Chang, MD's license?
NPPES lists California license number A199082, 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 Diana Julia Chang, MD prescribe under Medicare Part D?
In 2024, Diana Julia Chang, MD had 212 Medicare Part D claims for 99 beneficiaries; the average among otolaryngology physician prescribers was 541. 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.