John T. Leffers, OD
- Medicare patients, 2024
- 17
- Industry payments
- $87
- Affiliated sites
- 1
- Medical groups
- 2
- State license
- 1
- Practice address
- 15 Highland Ave, Seekonk, MA 02771
- Practice phone
- Call (781) 321-9039
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mass Optometric Associates
Seekonk, Massachusetts
Find John Leffers' 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.
John T. Leffers is an optometrist in Seekonk, Massachusetts
John Leffers practices at Mass Optometric Associates in Seekonk, Massachusetts.
John Leffers' NPI, 1235369349, was assigned on July 23, 2009. John Leffers holds Rhode Island license ODTG00540.
- NPI
- 1235369349NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012137847
- NPI enumeration date
- July 23, 2009
- NPI status
- Active
- Practice phone
- (781) 321-9039
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
John T. Leffers practices at Mass Optometric Associates in Seekonk, Massachusetts
John Leffers' primary practice is Mass Optometric Associates, at 15 Highland Ave, Seekonk, MA 02771 in Bristol County. The practice phone is (781) 321-9039.
- Mass Optometric Associates15 Highland Ave, Seekonk, MA 02771 · Bristol CountyPhone(781) 321-9039
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John T. Leffers is affiliated with 2 sites of care and 2 medical groups
John Leffers' primary practice is Mass Optometric Associates in Seekonk, Massachusetts. Dmand AI also links John Leffers to 2 medical groups and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John T. Leffers' practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Leffers practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mass Optometric Associates | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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John T. Leffers is one of 1,098 optometrists in Massachusetts
Optometrist is John Leffers' primary specialty in the NPI Registry, under taxonomy code 152W00000X. John Leffers is licensed in Rhode Island.
Specialties and state licenses
- Optometrist, Rhode IslandPrimary
Optometrists near John Leffers
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
John T. Leffers treated 17 Medicare patients in 2024, average age 73
CMS counts 17 Medicare patients who saw John Leffers in 2024. 75% of them have high cholesterol. Their average risk score is 0.70, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Leffers' median patient age at 62, with 59% women.
Chronic conditions among John Leffers' Medicare patients, 2024
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
John Leffers' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women59%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John T. Leffers received $87 in industry payments in 2025
CMS Open Payments shows 1 general payment to John Leffers from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Johnson & Johnson Vision Care, Inc. paid the most, $87.
Companies that paid John Leffers 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 John T. Leffers'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (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 John T. Leffers
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John T. Leffers' NPI number?
John T. Leffers' NPI number is 1235369349. It was assigned on July 23, 2009, and it is active in the NPI Registry.
What does John T. Leffers specialize in?
John T. Leffers is an optometrist in Seekonk, Massachusetts. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does John T. Leffers practice?
John Leffers practices at 15 Highland Ave, Seekonk, MA 02771. John Leffers' primary practice is Mass Optometric Associates in Seekonk, Massachusetts. Dmand AI also links John Leffers to 2 medical groups and 1 group practice or clinic.
What is John T. Leffers' office phone number?
The practice phone on file for John Leffers is (781) 321-9039.
What is John T. Leffers' medical license number?
John Leffers holds Rhode Island license ODTG00540.
How many Medicare patients does John T. Leffers see?
CMS counts 17 Medicare patients who saw John Leffers in 2024, with an average age of 73.
Has John T. Leffers received payments from drug or device companies?
CMS Open Payments shows $87 in general payments to John Leffers from 1 company from 2025 to 2025. The largest total came from Johnson & Johnson Vision Care, Inc.
How long has John T. Leffers been practicing?
John Leffers graduated from medical school in 2009, 17 years ago.
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