Thomas Chao, OD
- Part D claims, 2024
- 242
- Industry payments
- $23
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 165 Main St, Ossining, NY 10562
- Practice phone
- Call (914) 632-2737
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Open Door Care Network - Ossining
FQHC - Main Site · Ossining, New York
Find Thomas Chao's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Thomas Chao is an optometrist in Ossining, New York
Thomas Chao practices at Open Door Care Network - Ossining in Ossining, New York.
Thomas Chao's NPI, 1801974860, was assigned on November 1, 2006. Thomas Chao holds New York license 004983.
- NPI
- 1801974860NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7517862261
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (914) 632-2737
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Thomas Chao practices at Open Door Care Network - Ossining in Ossining, New York
Thomas Chao's primary practice is Open Door Care Network - Ossining, at 165 Main St, Ossining, NY 10562 in Westchester County. The practice phone is (914) 632-2737.
- Open Door Care Network - Ossining165 Main St, Ossining, NY 10562 · Westchester CountyPhone(914) 632-2737
Source: Dmand AI Affiliation Data
Thomas Chao is affiliated with 1 site of care and 1 medical group
Thomas Chao's primary practice is Open Door Care Network - Ossining in Ossining, New York. The medical group on file is Open Door Care Network. Thomas Chao's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Thomas Chao's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Thomas Chao practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Open Door Care Network - Ossining | Available with a free account |
Source: Dmand AI Technology Install Data
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Thomas Chao is one of 2,393 optometrists in New York
Optometrist is Thomas Chao's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Thomas Chao is licensed in New York.
Specialties and state licenses
- Optometrist, New YorkPrimary
Optometrists near Thomas Chao
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Thomas Chao's patients have a median age of 38
Across all payers, Dmand AI patient panel data puts Thomas Chao's median patient age at 38, with 60% women.
Thomas Chao's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women60%
- Men39%
Source: Dmand AI Patient Panel Data
Thomas Chao wrote 242 Medicare Part D claims in 2024
In 2024, Thomas Chao wrote 242 Medicare Part D claims for 71 patients. 69% of them were for generic drugs.
Thomas Chao's Part D claims by kind of drug, 2024
- Generic168 claims69%
- Brand-name74 claims31%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Thomas Chao takes part in Medicare
Thomas Chao accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Thomas Chao received $23 in industry payments in 2025
CMS Open Payments shows 2 general payments to Thomas Chao from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Bausch & Lomb Americas Inc. paid the most, $23.
Companies that paid Thomas Chao the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Thomas Chao's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Thomas Chao
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Thomas Chao's NPI number?
Thomas Chao's NPI number is 1801974860. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What does Thomas Chao specialize in?
Thomas Chao is an optometrist in Ossining, New York. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Thomas Chao practice?
Thomas Chao practices at 165 Main St, Ossining, NY 10562. Thomas Chao's primary practice is Open Door Care Network - Ossining in Ossining, New York.
What is Thomas Chao's office phone number?
The practice phone on file for Thomas Chao is (914) 632-2737.
What is Thomas Chao's medical license number?
Thomas Chao holds New York license 004983.
What medical group is Thomas Chao part of?
Thomas Chao is linked to Open Door Care Network.
Does Thomas Chao accept Medicare?
Yes. CMS lists Thomas Chao as accepting Medicare assignment.
Has Thomas Chao received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Thomas Chao from 1 company from 2025 to 2025. The largest total came from Bausch & Lomb Americas Inc.
How long has Thomas Chao been practicing?
Thomas Chao graduated from medical school in 1989, 37 years ago.
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