Dr. John A. Walker, MD
- Medicare services, 2024
- 279
- Medicare patients, 2024
- 224
- Part D claims, 2024
- 78
- Hospital affiliations
- 2
- Industry payments
- $2,841
- Practice address
- 2500 NE Neff Road, Bend, OR 97701
- Practice phone
- Call (541) 382-4321
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. John A. Walker is a gastroenterologist in Bend, Oregon
Dr. Walker practices at St. Charles Bend in Bend, Oregon, part of St. Charles Health System.
Dr. Walker's NPI, 1346210994, was assigned on January 25, 2006. Dr. Walker graduated from University of Texas Southwestern Medical School at Dallas in 1973. Dr. Walker holds Oregon license MD10503.
- NPI
- 1346210994NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0547239543
- NPI enumeration date
- January 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (541) 382-4321
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 79
- Medical school graduation
- 1973
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John A. Walker practices at St. Charles Bend in Bend, Oregon
Dr. Walker's primary practice is St. Charles Bend, at 2500 NE Neff Road, Bend, OR 97701 in Deschutes County. The practice phone is (541) 382-4321.
- St. Charles Bend2500 NE Neff Road, Bend, OR 97701 · Deschutes CountyPhone(541) 382-4321
Source: Dmand AI Affiliation Data
Dr. John A. Walker is affiliated with 2 sites of care and 1 medical group
Dr. Walker's primary practice is St. Charles Bend in Bend, Oregon, part of St. Charles Health System. Dr. Walker is also affiliated with CHI Mercy Health. The medical group on file is Centennial Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John A. Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walker practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Charles Bend | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across St. Charles Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John A. Walker is one of 226 gastroenterologists in Oregon
Gastroenterology is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Walker is licensed in Oregon.
Specialties and state licenses
- Gastroenterology, OregonPrimary
Gastroenterologists near Dr. Walker
Counts of gastroenterologists 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
Dr. John A. Walker billed Medicare for 279 services in 2024
CMS data shows 279 Medicare services from Dr. Walker across 7 procedure codes in 2024, for 224 Medicare patients. Medicare paid $38,432 for them.
Dr. Walker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 1212024: 23796%
- Other services
- 2023: 02024: 31
- Office and hospital visits
- 2023: 252024: 1156%
Where Dr. Walker's Medicare services took place, 2024
- In an office114%
- In a facility26896%
Dr. Walker compared with the Oregon median for gastroenterologists, 2024
- Dr. Walker
- Oregon median
- Medicare services
- 279vs 273Close to median
- Medicare patients
- 224vs 19018% above
- Part D claims
- 47vs 34086% below
Medians across 224 gastroenterologists in Oregon with Dmand AI profiles that report each measure.
Dr. Walker's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Walker and other gastroenterologists in Oregon.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John A. Walker treated 224 Medicare patients in 2024, average age 72
CMS counts 224 Medicare patients who saw Dr. Walker in 2024. The largest group is 65 to 74, with 110 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.09, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 60, with 60% women.
Dr. Walker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Walker's Medicare patients by sex, 2024
- Women12757%
- Men9743%
Chronic conditions among Dr. Walker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Diabetes30%
- Anxiety25%
- Mood disorders25%
- Depression24%
- Ischemic heart disease22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women60%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John A. Walker wrote 78 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 78 Medicare Part D claims for 68 patients. 77% of them were for generic drugs. CMS names the drug for 47 of them, across 1 drug with 11 or more claims each, at $3,283 in total drug cost. In 2023, CMS named 162 claims across 6 drugs.
Dr. Walker's Part D claims by kind of drug, 2024
- Generic60 claims77%
- Brand-name18 claims23%
Dr. Walker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1622024: 4771%
Drugs named by CMS: 1 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. John A. Walker ranks in the 72nd percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Walker accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 79 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Walker, more than 72% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Walker ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 72nd percentile79 procedures
- Colonoscopy
- 70th percentile66 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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Dr. John A. Walker received $2,841 in industry payments from 2016 to 2024
CMS Open Payments shows 155 general payments to Dr. Walker from 23 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $892.
General payments to Dr. Walker by program year, 2016 to 2024
Companies that paid Dr. Walker the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John A. Walker graduated from University of Texas Southwestern Medical School at Dallas
Dr. Walker graduated from University of Texas Southwestern Medical School at Dallas in 1973.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John A. Walker'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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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 and Drug (CMS) (opens in a new tab)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 Dr. John A. Walker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John A. Walker's NPI number?
Dr. John A. Walker's NPI number is 1346210994. It was assigned on January 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John A. Walker?
Dr. John A. Walker is a gastroenterologist in Bend, Oregon. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. John A. Walker practice?
Dr. Walker practices at 2500 NE Neff Road, Bend, OR 97701. Dr. Walker's primary practice is St. Charles Bend in Bend, Oregon, part of St. Charles Health System.
What is Dr. John A. Walker's office phone number?
The practice phone on file for Dr. Walker is (541) 382-4321.
What is Dr. John A. Walker's medical license number?
Dr. Walker holds Oregon license MD10503.
Which hospitals is Dr. John A. Walker affiliated with?
Dr. Walker practices at St. Charles Bend in Bend, Oregon. Dr. Walker is also affiliated with CHI Mercy Health.
What medical group is Dr. John A. Walker part of?
Dr. Walker is linked to Centennial Medical Group.
Does Dr. John A. Walker accept Medicare?
Yes. CMS data shows Dr. Walker billed Medicare for 279 services in 2024, and Dr. Walker accepts Medicare assignment.
How many Medicare patients does Dr. John A. Walker see?
CMS counts 224 Medicare patients who saw Dr. Walker in 2024, with an average age of 72.
What services does Dr. John A. Walker bill to Medicare?
In 2024, Dr. Walker's most billed Medicare services were surgery: digestive system (45385), surgery: digestive system (43235) and surgery: digestive system (43239).
Show 4 more questionsShow fewer questions
Where did Dr. John A. Walker go to medical school?
Dr. Walker graduated from University of Texas Southwestern Medical School at Dallas in 1973.
What drugs does Dr. John A. Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Sod Sulf-Potass Sulf-Mag Sulf.
Has Dr. John A. Walker received payments from drug or device companies?
CMS Open Payments shows $2,841 in general payments to Dr. Walker from 23 companies from 2016 to 2024. The largest total came from Abbvie Inc.
How long has Dr. John A. Walker been practicing?
Dr. Walker graduated from medical school in 1973, 53 years ago.
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