Grant William Knowles, OD
- Medicare patients, 2024
- 132
- Part D claims, 2024
- 172
- Industry payments
- $65
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 506 Main St, Dallas, OR 97338
- Practice phone
- Call (503) 623-9233
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Central Vision Clinic
Dallas, Oregon
Find Grant Knowles' 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.
Grant William Knowles is an optometrist in Dallas, Oregon
Grant Knowles practices at Central Vision Clinic in Dallas, Oregon.
Grant Knowles' NPI, 1710362058, was assigned on July 28, 2015. Grant Knowles graduated from Pacific University - College of Optometry in 2015. Grant Knowles holds Oregon license 3614ATI.
- NPI
- 1710362058NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9739484494
- NPI enumeration date
- July 28, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (503) 623-9233
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Grant William Knowles practices at Central Vision Clinic in Dallas, Oregon
Grant Knowles' primary practice is Central Vision Clinic, at 506 Main St, Dallas, OR 97338 in Polk County. The practice phone is (503) 623-9233.
- Central Vision Clinic506 Main St, Dallas, OR 97338 · Polk CountyPhone(503) 623-9233
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Grant William Knowles is affiliated with 2 sites of care and 1 medical group
Grant Knowles' primary practice is Central Vision Clinic in Dallas, Oregon. Dmand AI also links Grant Knowles 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 Grant William Knowles' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Grant Knowles practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Central Vision Clinic | 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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Grant William Knowles is one of 721 optometrists in Oregon
Optometrist is Grant Knowles' primary specialty in the NPI Registry, under taxonomy code 152W00000X. Grant Knowles is licensed in Oregon.
Specialties and state licenses
- Optometrist, OregonPrimary
Optometrists near Grant Knowles
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
Grant William Knowles treated 132 Medicare patients in 2024, average age 73
CMS counts 132 Medicare patients who saw Grant Knowles in 2024. The largest group is 65 to 74, with 68 patients. 63% of them have high blood pressure, and 58% have high cholesterol. 13% are also on Medicaid. Their average risk score is 0.81, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Grant Knowles' median patient age at 70, with 58% women.
Grant Knowles' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Grant Knowles' Medicare patients by sex, 2024
- Women7758%
- Men5542%
Chronic conditions among Grant Knowles' Medicare patients, 2024
- High blood pressure63%
- High cholesterol58%
- Arthritis38%
- Diabetes30%
- Mood disorders19%
- Depression16%
- Anxiety14%
- Chronic kidney disease14%
Share of Medicare patients with each condition. A patient can have several.
Grant Knowles' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Grant William Knowles wrote 172 Medicare Part D claims in 2024
In 2024, Grant Knowles wrote 172 Medicare Part D claims for 70 patients. 72% of them were for generic drugs.
Grant Knowles' Part D claims by kind of drug, 2024
- Generic123 claims72%
- Brand-name49 claims28%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Grant William Knowles takes part in Medicare
Grant Knowles accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Grant William Knowles received $65 in industry payments in 2025
CMS Open Payments shows 1 general payment to Grant Knowles 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, $65.
Companies that paid Grant Knowles the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Grant William Knowles graduated from Pacific University - College of Optometry
Grant Knowles graduated from Pacific University - College of Optometry in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Grant William Knowles'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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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 Grant William Knowles
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Grant William Knowles' NPI number?
Grant William Knowles' NPI number is 1710362058. It was assigned on July 28, 2015, and it is active in the NPI Registry.
What does Grant William Knowles specialize in?
Grant William Knowles is an optometrist in Dallas, Oregon. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Grant William Knowles practice?
Grant Knowles practices at 506 Main St, Dallas, OR 97338. Grant Knowles' primary practice is Central Vision Clinic in Dallas, Oregon. Dmand AI also links Grant Knowles to 1 group practice or clinic and 1 medical group.
What is Grant William Knowles' office phone number?
The practice phone on file for Grant Knowles is (503) 623-9233.
What is Grant William Knowles' medical license number?
Grant Knowles holds Oregon license 3614ATI.
Does Grant William Knowles accept Medicare?
Yes. CMS lists Grant Knowles as accepting Medicare assignment.
How many Medicare patients does Grant William Knowles see?
CMS counts 132 Medicare patients who saw Grant Knowles in 2024, with an average age of 73.
Where did Grant William Knowles go to medical school?
Grant Knowles graduated from Pacific University - College of Optometry in 2015.
Has Grant William Knowles received payments from drug or device companies?
CMS Open Payments shows $65 in general payments to Grant Knowles from 1 company from 2025 to 2025. The largest total came from Johnson & Johnson Vision Care, Inc.
How long has Grant William Knowles been practicing?
Grant Knowles graduated from medical school in 2015, 11 years ago.
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