Dr. Nicholas E. Walker, MD
- Medicare services, 2024
- 1,381
- Medicare patients, 2024
- 851
- Part D claims, 2024
- 3,981
- MIPS score, 2024
- 80
- Hospital affiliations
- 5
- Practice address
- 200 Hawkins Drive, Iowa City, IA 52242
- Practice phone
- Call (319) 356-1616
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Walker's professional email, personal email and mobile number
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Dr. Nicholas E. Walker is an interventional cardiologist in Iowa City, Iowa
Dr. Walker practices at University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa.
Dr. Walker's NPI, 1437241221, was assigned on September 29, 2006. Dr. Walker graduated from University of Iowa, RJ & L Carver College of Medicine in 2000. Dr. Walker holds Iowa license 35043.
- NPI
- 1437241221NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6709986672
- NPI enumeration date
- September 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (319) 356-1616
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nicholas E. Walker practices at University of Iowa Health Care Medical Center in Iowa City, Iowa
Dr. Walker's primary practice is University of Iowa Health Care Medical Center, at 200 Hawkins Drive, Iowa City, IA 52242 in Johnson County. The practice phone is (319) 356-1616.
- University of Iowa Health Care Medical Center200 Hawkins Drive, Iowa City, IA 52242 · Johnson CountyPhone(319) 356-1616
Source: Dmand AI Affiliation Data
Dr. Nicholas E. Walker is affiliated with 5 sites of care and 1 medical group
Dr. Walker's primary practice is University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa. Dr. Walker is also affiliated with University of Iowa Health Care Medical Center Downtown. The medical group on file is Scanlan Center for School Mental Health Clinic. Dmand AI also links Dr. Walker to 3 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nicholas E. 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 |
|---|---|
| University of Iowa Health Care Medical 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. Nicholas E. Walker is one of 58 interventional cardiologists in Iowa
Interventional cardiology is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 207RI0011X. Dr. Walker is licensed in Iowa.
Specialties and state licenses
- Interventional cardiology, IowaPrimary
Interventional cardiologists near Dr. Walker
Counts of interventional cardiologists 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. Nicholas E. Walker billed Medicare for 1,381 services in 2024
CMS data shows 1,381 Medicare services from Dr. Walker across 17 procedure codes in 2024, for 851 Medicare patients. Medicare paid $89,730 for them.
Dr. Walker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7952024: 68314%
- Tests and treatments
- 2023: 5532024: 65619%
- Imaging
- 2023: 422024: 42No change
Where Dr. Walker's Medicare services took place, 2024
- In an office93368%
- In a facility44832%
Dr. Walker compared with the Iowa median for interventional cardiologists, 2024
- Dr. Walker
- Iowa median
- Medicare services
- 1,381vs 1,72820% below
- Medicare patients
- 851vs 9106% below
- Part D claims
- 3,806vs 1,5672.4 times
Medians across 61 interventional cardiologists in Iowa 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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicholas E. Walker treated 851 Medicare patients in 2024, average age 76
CMS counts 851 Medicare patients who saw Dr. Walker in 2024. The largest group is 65 to 74, with 341 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.35, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 76, with 37% women.
Dr. Walker's Medicare patients by age, 2024
Dr. Walker's Medicare patients by sex, 2024
- Women34541%
- Men50659%
Chronic conditions among Dr. Walker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease61%
- Arthritis40%
- Atrial fibrillation37%
- Heart failure36%
- Diabetes35%
- Chronic kidney disease31%
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 76
Patient panel by sex, all payers
- Women37%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nicholas E. Walker wrote 3,981 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 3,981 Medicare Part D claims for 631 patients. 88% of them were for generic drugs. CMS names the drug for 3,806 of them, across 39 drugs with 11 or more claims each, at $427,133 in total drug cost. In 2023, CMS named 3,908 claims across 40 drugs.
Dr. Walker's Part D claims by kind of drug, 2024
- Generic3,514 claims88%
- Brand-name467 claims12%
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
- Antibiotics0%11 of 3,981 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: 3,9082024: 3,8063%
Drugs named by CMS: 39 in 2024, 40 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. Nicholas E. Walker scored 80 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 80 out of 100 for Dr. Walker for performance year 2024, reported as part of a group. Dr. Walker accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 34 procedures of coronary angioplasty and stenting by Dr. Walker, more than 71% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Walker's MIPS scores, performance year 2024
- 80of 100Final score
- 75.7of 100Quality
- 78of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Walker ranks in Medicare procedure volume
- Coronary angioplasty and stenting
- 71st percentile34 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Nicholas E. Walker received $2,464 in industry payments from 2017 to 2025
CMS Open Payments shows 32 general payments to Dr. Walker from 7 drug and device companies from 2017 to 2025. Travel and lodging make up the largest share, 63% of the total. Medtronic, Inc. paid the most, $1,804.
General payments to Dr. Walker by program year, 2017 to 2025
General payments to Dr. Walker by kind, 2017 to 2025
- Travel and lodging$1,54963%
- Food and beverage$91637%
Companies that paid Dr. Walker the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nicholas E. Walker graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Walker graduated from University of Iowa, RJ & L Carver College of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nicholas E. 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)Clinician Public Reporting: Overall MIPS Performance (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. Nicholas E. 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. Nicholas E. Walker's NPI number?
Dr. Nicholas E. Walker's NPI number is 1437241221. It was assigned on September 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas E. Walker?
Dr. Nicholas E. Walker is an interventional cardiologist in Iowa City, Iowa. The primary specialty in the NPI Registry is Interventional Cardiology Physician (taxonomy code 207RI0011X).
Where does Dr. Nicholas E. Walker practice?
Dr. Walker practices at 200 Hawkins Drive, Iowa City, IA 52242. Dr. Walker's primary practice is University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa. Dmand AI also links Dr. Walker to 3 hospitals.
What is Dr. Nicholas E. Walker's office phone number?
The practice phone on file for Dr. Walker is (319) 356-1616.
What is Dr. Nicholas E. Walker's medical license number?
Dr. Walker holds Iowa license 35043.
Which hospitals is Dr. Nicholas E. Walker affiliated with?
Dr. Walker practices at University of Iowa Health Care Medical Center in Iowa City, Iowa. Dr. Walker is also affiliated with University of Iowa Health Care Medical Center Downtown. Dmand AI links Dr. Walker to 3 more hospitals.
What medical group is Dr. Nicholas E. Walker part of?
Dr. Walker is linked to Scanlan Center for School Mental Health Clinic.
Does Dr. Nicholas E. Walker accept Medicare?
Yes. CMS data shows Dr. Walker billed Medicare for 1,381 services in 2024, and Dr. Walker accepts Medicare assignment.
What is Dr. Nicholas E. Walker's MIPS score?
Dr. Walker's MIPS final score for performance year 2024 is 80 out of 100, reported as part of a group.
How many Medicare patients does Dr. Nicholas E. Walker see?
CMS counts 851 Medicare patients who saw Dr. Walker in 2024, with an average age of 76.
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What services does Dr. Nicholas E. Walker bill to Medicare?
In 2024, Dr. Walker's most billed Medicare services were office visit, established patient (99214), heart test or procedure (93010) and special service (99152).
Where did Dr. Nicholas E. Walker go to medical school?
Dr. Walker graduated from University of Iowa, RJ & L Carver College of Medicine in 2000.
What drugs does Dr. Nicholas E. Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Metoprolol Succinate, Atorvastatin Calcium and Lisinopril.
Has Dr. Nicholas E. Walker received payments from drug or device companies?
CMS Open Payments shows $2,464 in general payments to Dr. Walker from 7 companies from 2017 to 2025. The largest total came from Medtronic, Inc.
How long has Dr. Nicholas E. Walker been practicing?
Dr. Walker graduated from medical school in 2000, 26 years ago.
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