Dr. Mark Christopher Walker, MD
- Part D claims, 2024
- 114
- Industry payments
- $249
- State license
- 1
- Year NPI issued
- 2007
- Practice address
- 3000 N Halsted St, Chicago, IL 60657
- Practice phone
- Call (312) 908-7878
- 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
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. Mark Christopher Walker is a psychiatrist in Chicago, Illinois
Dr. Walker practices in Chicago, Illinois.
Dr. Walker's NPI, 1265561724, was assigned on March 2, 2007. Dr. Walker holds Illinois license 36-063569.
- NPI
- 1265561724NPI Registry (opens in a new tab)
- NPI enumeration date
- March 2, 2007
- NPI status
- Active
- Practice phone
- (312) 908-7878
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Mark Christopher Walker's practice address is in Chicago, Illinois
Dr. Walker's practice address in the NPI Registry is 3000 N Halsted St, Chicago, IL 60657, in Cook County. The practice phone is (312) 908-7878.
- NPI Registry address3000 N Halsted St, Chicago, IL 60657 · Cook CountyPhone(312) 908-7878
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Mark Christopher Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walker practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Walker's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Christopher Walker is one of 1,527 psychiatrists in Illinois
Psychiatry is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Walker is licensed in Illinois.
Specialties and state licenses
- Psychiatry, IllinoisPrimary
Psychiatrists near Dr. Walker
Counts of psychiatrists 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. Mark Christopher Walker's patients have a median age of 27
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 27, with 50% women.
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 27
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Mark Christopher Walker wrote 114 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 114 Medicare Part D claims for 13 patients. 100% of them were for generic drugs. CMS names the drug for 64 of them, across 4 drugs with 11 or more claims each, at $1,219 in total drug cost. In 2023, CMS named 50 claims across 3 drugs.
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: 502024: 6428%
Drugs named by CMS: 4 in 2024, 3 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
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Dr. Mark Christopher Walker received $249 in industry payments from 2018 to 2024
CMS Open Payments shows 3 general payments to Dr. Walker from 2 drug and device companies from 2018 to 2024. Food and beverage make up the largest share, 88% of the total. Allergan Inc. paid the most, $141.
General payments to Dr. Walker by program year, 2018 to 2024
General payments to Dr. Walker by kind, 2018 to 2024
- Food and beverage$21988%
- Education$3012%
Companies that paid Dr. Walker the most, 2018 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark Christopher 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Mark Christopher 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. Mark Christopher Walker's NPI number?
Dr. Mark Christopher Walker's NPI number is 1265561724. It was assigned on March 2, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Christopher Walker?
Dr. Mark Christopher Walker is a psychiatrist in Chicago, Illinois. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Mark Christopher Walker practice?
Dr. Walker practices at 3000 N Halsted St, Chicago, IL 60657.
What is Dr. Mark Christopher Walker's office phone number?
The practice phone on file for Dr. Walker is (312) 908-7878.
What is Dr. Mark Christopher Walker's medical license number?
Dr. Walker holds Illinois license 36-063569.
What drugs does Dr. Mark Christopher Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Sertraline HCl, Escitalopram Oxalate and Bupropion XL.
Has Dr. Mark Christopher Walker received payments from drug or device companies?
CMS Open Payments shows $249 in general payments to Dr. Walker from 2 companies from 2018 to 2024. The largest total came from Allergan Inc.
How long has Dr. Mark Christopher Walker been practicing?
Dr. Walker's NPI was assigned in 2007.
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