John L. Baker, OD
- Medicare patients, 2024
- 25
- Part D claims, 2024
- 60
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 3450 Lacey Rd, Downers Grove, IL 60515
- Practice phone
- Call (630) 743-4500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Midwestern University Eye Institute-Downers Grove
Downers Grove, Illinois
Find John Baker'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.
John L. Baker is an optometrist in Downers Grove, Illinois
John Baker practices at Midwestern University Eye Institute-Downers Grove in Downers Grove, Illinois.
John Baker's NPI, 1447243936, was assigned on August 30, 2005. John Baker graduated from Pennsylvania College of Optometry in 1984. John Baker holds Illinois license 046008191.
- NPI
- 1447243936NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2567500499
- NPI enumeration date
- August 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 743-4500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
John L. Baker practices at Midwestern University Eye Institute-Downers Grove in Downers Grove, Illinois
John Baker's primary practice is Midwestern University Eye Institute-Downers Grove, at 3450 Lacey Rd, Downers Grove, IL 60515 in Dupage County. The practice phone is (630) 743-4500.
- Midwestern University Eye Institute-Downers Grove3450 Lacey Rd, Downers Grove, IL 60515 · Dupage CountyPhone(630) 743-4500
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John L. Baker is affiliated with 2 sites of care and 1 medical group
John Baker's primary practice is Midwestern University Eye Institute-Downers Grove in Downers Grove, Illinois. Dmand AI also links John Baker to 1 group practice or clinic and 1 medical group, 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 L. Baker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Baker practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Midwestern University Eye Institute-Downers Grove | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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John L. Baker is one of 2,194 optometrists in Illinois
Optometrist is John Baker's primary specialty in the NPI Registry, under taxonomy code 152W00000X. John Baker is licensed in Illinois.
Specialties and state licenses
- Optometrist, IllinoisPrimary
Optometrists near John Baker
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 L. Baker treated 25 Medicare patients in 2024, average age 61
CMS counts 25 Medicare patients who saw John Baker in 2024. The largest group is under 65, with 13 patients. 75% of them have high blood pressure, and 56% have arthritis. Their average risk score is 1.62, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts John Baker's median patient age at 69, with 68% women.
John Baker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among John Baker's Medicare patients, 2024
- High blood pressure75%
- Arthritis56%
- High cholesterol56%
Share of Medicare patients with each condition. A patient can have several.
John Baker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women68%
- Men32%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John L. Baker wrote 60 Medicare Part D claims in 2024
In 2024, John Baker wrote 60 Medicare Part D claims for 11 patients. 75% of them were for generic drugs.
John Baker's Part D claims by kind of drug, 2024
- Generic45 claims75%
- Brand-name15 claims25%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How John L. Baker takes part in Medicare
John Baker 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)
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John L. Baker graduated from Pennsylvania College of Optometry
John Baker graduated from Pennsylvania College of Optometry in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for John L. Baker'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) |
| 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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 L. Baker
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 L. Baker's NPI number?
John L. Baker's NPI number is 1447243936. It was assigned on August 30, 2005, and it is active in the NPI Registry.
What does John L. Baker specialize in?
John L. Baker is an optometrist in Downers Grove, Illinois. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does John L. Baker practice?
John Baker practices at 3450 Lacey Rd, Downers Grove, IL 60515. John Baker's primary practice is Midwestern University Eye Institute-Downers Grove in Downers Grove, Illinois. Dmand AI also links John Baker to 1 group practice or clinic and 1 medical group.
What is John L. Baker's office phone number?
The practice phone on file for John Baker is (630) 743-4500.
What is John L. Baker's medical license number?
John Baker holds Illinois license 046008191.
Does John L. Baker accept Medicare?
Yes. CMS lists John Baker as accepting Medicare assignment.
How many Medicare patients does John L. Baker see?
CMS counts 25 Medicare patients who saw John Baker in 2024, with an average age of 61.
Where did John L. Baker go to medical school?
John Baker graduated from Pennsylvania College of Optometry in 1984.
How long has John L. Baker been practicing?
John Baker graduated from medical school in 1984, 42 years ago.
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