John Marshall, OD
- Medicare patients, 2024
- 240
- Part D claims, 2024
- 237
- Affiliated sites
- 2
- Medical group
- 1
- State license
- 1
- Practice address
- 300 Veterans, Big Spring, TX 79720
- Practice phone
- Call (432) 263-7361
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
George H. O'Brien, Jr., Department of Veterans Affairs Medical Center
VA Clinic / Health Facility · Big Spring, Texas
Find John Marshall'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 Marshall is an optometrist in Big Spring, Texas
John Marshall practices at George H. O'Brien, Jr., Department of Veterans Affairs Medical Center in Big Spring, Texas.
John Marshall's NPI, 1295754000, was assigned on July 19, 2006. John Marshall graduated from University of Houston - College of Optometry in 1979. John Marshall holds Texas license 2618TG.
- NPI
- 1295754000NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4587773650
- NPI enumeration date
- July 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (432) 263-7361
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John Marshall practices at George H. O'Brien, Jr., Department of Veterans Affairs Medical Center in Big Spring, Texas
John Marshall's primary practice is George H. O'Brien, Jr., Department of Veterans Affairs Medical Center, at 300 Veterans, Big Spring, TX 79720. The practice phone is (432) 263-7361.
- George H. O'Brien, Jr., Department of Veterans Affairs Medical Center300 Veterans, Big Spring, TX 79720Phone(432) 263-7361
Source: Dmand AI Affiliation Data
John Marshall is affiliated with 2 sites of care and 1 medical group
John Marshall's primary practice is George H. O'Brien, Jr., Department of Veterans Affairs Medical Center in Big Spring, Texas. Dmand AI also links John Marshall to 1 group practice or clinic and 1 medical group, each named with a free account. John Marshall's employer is on file too: a government & correctional health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at John Marshall's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Marshall practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| George H. O'Brien, Jr., Department of Veterans Affairs Medical Center | 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 Marshall is one of 3,272 optometrists in Texas
Optometrist is John Marshall's primary specialty in the NPI Registry, under taxonomy code 152W00000X. John Marshall is licensed in Texas.
Specialties and state licenses
- Optometrist, TexasPrimary
Optometrists near John Marshall
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 Marshall treated 240 Medicare patients in 2024, average age 76
CMS counts 240 Medicare patients who saw John Marshall in 2024. The largest group is 65 to 74, with 101 patients. 75% of them have high blood pressure, and 71% have high cholesterol. 8% are also on Medicaid. Their average risk score is 1.00, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Marshall's median patient age at 72, with 64% women.
John Marshall's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
John Marshall's Medicare patients by sex, 2024
- Women15565%
- Men8535%
Chronic conditions among John Marshall's Medicare patients, 2024
- High blood pressure75%
- High cholesterol71%
- Arthritis49%
- Diabetes35%
- Ischemic heart disease33%
- Heart failure20%
- Anxiety19%
- Atrial fibrillation16%
Share of Medicare patients with each condition. A patient can have several.
John Marshall's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women64%
- Men34%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John Marshall wrote 237 Medicare Part D claims in 2024
In 2024, John Marshall wrote 237 Medicare Part D claims for 45 patients. 70% of them were for generic drugs.
John Marshall's Part D claims by kind of drug, 2024
- Generic167 claims70%
- Brand-name70 claims30%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
John Marshall ranks in the 49th percentile for cataract surgery in Medicare
John Marshall accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 25 procedures of cataract surgery by John Marshall, more than 49% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where John Marshall ranks in Medicare procedure volume
- Cataract surgery
- 49th percentile25 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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John Marshall graduated from University of Houston - College of Optometry
John Marshall graduated from University of Houston - College of Optometry in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for John Marshall'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 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) |
| 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 Marshall
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 Marshall's NPI number?
John Marshall's NPI number is 1295754000. It was assigned on July 19, 2006, and it is active in the NPI Registry.
What does John Marshall specialize in?
John Marshall is an optometrist in Big Spring, Texas. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does John Marshall practice?
John Marshall practices at 300 Veterans, Big Spring, TX 79720. John Marshall's primary practice is George H. O'Brien, Jr., Department of Veterans Affairs Medical Center in Big Spring, Texas. Dmand AI also links John Marshall to 1 group practice or clinic and 1 medical group.
What is John Marshall's office phone number?
The practice phone on file for John Marshall is (432) 263-7361.
What is John Marshall's medical license number?
John Marshall holds Texas license 2618TG.
Does John Marshall accept Medicare?
Yes. CMS lists John Marshall as accepting Medicare assignment.
How many Medicare patients does John Marshall see?
CMS counts 240 Medicare patients who saw John Marshall in 2024, with an average age of 76.
Where did John Marshall go to medical school?
John Marshall graduated from University of Houston - College of Optometry in 1979.
How long has John Marshall been practicing?
John Marshall graduated from medical school in 1979, 47 years ago.
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