Diana Katsman, MD
Ophthalmology Physician · Torrance, CA
Diana Katsman, MD is an ophthalmology physician with a practice address in Torrance, California, and NPI 1306003132, issued on May 20, 2008. Check the license (California A112485, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diana Katsman
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A112485 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1000 West Carson Street, Torrance, CA 90509
- Phone
- (310) 222-2409
- Enumerated
- May 20, 2008
- Record last updated
- Apr 4, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160902000801); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 1000 West Carson Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diana Katsman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A112485Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,359 Medicare Part D claims for 269 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 61% of claims.
Most prescribed
- Cyclosporine276 claims
- Latanoprost136 claims
- Neomycin-Polymyxin-Dexameth113 claims
- Restasis81 claims
- Brimonidine Tartrate66 claims
- Dorzolamide-Timolol62 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $678.30
18 payments; by number, the most common kind was food and beverage; the largest payer was Apellis Pharmaceuticals, Inc. The 13,221 providers of this specialty with any payment received $4,535.02 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.
Diana Katsman among 2,899 ophthalmology physician records in California
Diana Katsman, MD is one of 2,899 ophthalmology physician records with a practice address in California. 79% 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 67% of them.
- NPI issued2008 · 67% of these records are older, 28% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2008 · median 2001 among the 1,907 with a school on file
- Record last updated2018 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Torrance → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Damien Goldberg, M.D.Torrance, CA 905051891833695
- Steven Khwarg, MDTorrance, CA 905051316007230
- Amr KouchoukTorrance, CA 905051639499718
- Alex Liu, M.D.Torrance, CA 905051275553158
- Angus Macdonald, MDTorrance, CA 905051023164415
- John Maher, M.D.Torrance, CA 905051265561211
- Alfred Marrone, M.D.Torrance, CA 905051841388907
- Lydia Matkovich, M.D.Torrance, CA 905051508801028
Common questions
What is Diana Katsman, MD's NPI number?
Diana Katsman, MD's National Provider Identifier (NPI) is 1306003132, issued on May 20, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Diana Katsman, MD located?
The NPPES record lists a practice address at 1000 West Carson Street, Torrance, CA, 90509. Phone: (310) 222-2409. Providers update this record themselves, so call before visiting.
How can I verify Diana Katsman, MD's license?
NPPES lists California license number A112485, 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 Katsman, MD prescribe under Medicare Part D?
In 2024, Diana Katsman, MD had 1,359 Medicare Part D claims for 269 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Diana Katsman, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.