Dr. Nathan R. Walker, MD
- Medicare services, 2024
- 9,416
- Medicare patients, 2024
- 551
- Part D claims, 2024
- 17,719
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 101 W University Ave, Champaign, IL 61820
- Practice phone
- Call (217) 366-1270
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Christie Clinic Amblatory Surgery Center
Surgery Center - Not Medicare-Certified · Champaign, Illinois
Find Dr. Walker'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.
Dr. Nathan R. Walker is an internist in Champaign, Illinois
Dr. Walker practices at Christie Clinic Amblatory Surgery Center in Champaign, Illinois.
Dr. Walker's NPI, 1629087325, was assigned on August 5, 2006. Dr. Walker graduated from University of Cincinnati College of Medicine in 2002. Dr. Walker holds Illinois license 036-114466.
- NPI
- 1629087325NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8426075029
- NPI enumeration date
- August 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (217) 366-1270
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nathan R. Walker practices at Christie Clinic Amblatory Surgery Center in Champaign, Illinois
Dr. Walker's primary practice is Christie Clinic Amblatory Surgery Center, at 101 W University Ave, Champaign, IL 61820. The practice phone is (217) 366-1270.
- Christie Clinic Amblatory Surgery Center101 W University Ave, Champaign, IL 61820Phone(217) 366-1270
Source: Dmand AI Affiliation Data
Dr. Nathan R. Walker is affiliated with 5 sites of care and 1 medical group
Dr. Walker's primary practice is Christie Clinic Amblatory Surgery Center in Champaign, Illinois. Dr. Walker is also affiliated with Carle Foundation Hospital. The medical group on file is Christie Clinic. Dmand AI also links Dr. Walker to 1 more breast imaging center, 1 group practice or clinic and 1 home health agency, each named with a free account. Dr. Walker's employer is on file too: a surgery center (asc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nathan R. Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walker practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Christie Clinic Amblatory Surgery Center | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nathan R. Walker is one of 5,652 internists in Illinois
Internal medicine is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Walker is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Walker
Counts of internists 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. Nathan R. Walker billed Medicare for 9,416 services in 2024
CMS data shows 9,416 Medicare services from Dr. Walker across 48 procedure codes in 2024, for 551 Medicare patients. Medicare paid $259,942 for them. Every service was in an office.
Dr. Walker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 4,0222024: 3,54312%
- Drugs given in the office
- 2023: 2,1862024: 2,0228%
- Office and hospital visits
- 2023: 1,5032024: 1,5694%
- Other services
- 2023: 3402024: 1,306284%
- Surgery
- 2023: 7742024: 7246%
- Tests and treatments
- 2023: 2232024: 25213%
Dr. Walker compared with the Illinois median for internists, 2024
- Dr. Walker
- Illinois median
- Medicare services
- 9,416vs 56616.6 times
- Medicare patients
- 551vs 2082.6 times
- Part D claims
- 16,819vs 28459.2 times
Medians across 5,192 internists in Illinois 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.
Need commercial claims for Dr. Walker?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Walker and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nathan R. Walker treated 551 Medicare patients in 2024, average age 73
CMS counts 551 Medicare patients who saw Dr. Walker in 2024. The largest group is 65 to 74, with 277 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.19, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 65, with 42% women.
Dr. Walker's Medicare patients by age, 2024
Dr. Walker's Medicare patients by sex, 2024
- Women23142%
- Men32058%
Chronic conditions among Dr. Walker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis45%
- Diabetes33%
- Ischemic heart disease29%
- Anxiety22%
- Mood disorders21%
- Chronic kidney disease18%
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 65
Patient panel by sex, all payers
- Women42%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nathan R. Walker wrote 17,719 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 17,719 Medicare Part D claims for 1,152 patients. 87% of them were for generic drugs. CMS names the drug for 16,819 of them, across 200 drugs with 11 or more claims each, at $1,732,228 in total drug cost. In 2023, CMS named 16,087 claims across 194 drugs.
Dr. Walker's Part D claims by kind of drug, 2024
- Generic15,365 claims87%
- Brand-name2,266 claims13%
- Other88 claims0%
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.
Drug classes CMS tracks in Dr. Walker's Part D claims, 2024
- Opioids7%1,237 of 17,719 claims
- Antibiotics2%337 of 17,719 claims
- Antipsychotics, patients 65 and over0%72 of 17,719 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 16,0872024: 16,8195%
Drugs named by CMS: 200 in 2024, 194 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. Nathan R. Walker offers telehealth to Medicare patients
Dr. Walker accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Walker as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Nathan R. Walker has 1 publication on record
Dmand AI links 1 paper to Dr. Walker in 2024.
Recent publications by Dr. Walker
See who Dr. Walker researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Walker works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nathan R. Walker received $4,731 in industry payments from 2016 to 2024
CMS Open Payments shows 400 general payments to Dr. Walker from 25 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 92% of the total. Eli Lilly and Company paid the most, $728.
General payments to Dr. Walker by program year, 2016 to 2024
General payments to Dr. Walker by kind, 2016 to 2024
- Food and beverage$4,37192%
- Education$3618%
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. Nathan R. Walker graduated from University of Cincinnati College of Medicine
Dr. Walker graduated from University of Cincinnati College of Medicine in 2002.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nathan R. 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Nathan R. 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. Nathan R. Walker's NPI number?
Dr. Nathan R. Walker's NPI number is 1629087325. It was assigned on August 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nathan R. Walker?
Dr. Nathan R. Walker is an internist in Champaign, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Nathan R. Walker practice?
Dr. Walker practices at 101 W University Ave, Champaign, IL 61820. Dr. Walker's primary practice is Christie Clinic Amblatory Surgery Center in Champaign, Illinois. Dmand AI also links Dr. Walker to 1 breast imaging center, 1 group practice or clinic and 1 home health agency.
What is Dr. Nathan R. Walker's office phone number?
The practice phone on file for Dr. Walker is (217) 366-1270.
What is Dr. Nathan R. Walker's medical license number?
Dr. Walker holds Illinois license 036-114466.
Which hospitals is Dr. Nathan R. Walker affiliated with?
Dr. Walker is affiliated with Carle Foundation Hospital.
What medical group is Dr. Nathan R. Walker part of?
Dr. Walker is linked to Christie Clinic.
Does Dr. Nathan R. Walker accept Medicare?
Yes. CMS data shows Dr. Walker billed Medicare for 9,416 services in 2024, and Dr. Walker accepts Medicare assignment.
Does Dr. Nathan R. Walker offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Walker as offering telehealth services.
How many Medicare patients does Dr. Nathan R. Walker see?
CMS counts 551 Medicare patients who saw Dr. Walker in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
What services does Dr. Nathan R. Walker bill to Medicare?
In 2024, Dr. Walker's most billed Medicare services were injected or infused drug (J0897), medicare service (G2211) and office visit, established patient (99214).
Where did Dr. Nathan R. Walker go to medical school?
Dr. Walker graduated from University of Cincinnati College of Medicine in 2002.
What drugs does Dr. Nathan R. Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Hydrocodone-Acetaminophen.
Has Dr. Nathan R. Walker received payments from drug or device companies?
CMS Open Payments shows $4,731 in general payments to Dr. Walker from 25 companies from 2016 to 2024. The largest total came from Eli Lilly and Company.
How long has Dr. Nathan R. Walker been practicing?
Dr. Walker graduated from medical school in 2002, 24 years ago.
Does Dr. Nathan R. Walker do research?
Dmand AI links 1 publication to Dr. Walker.
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