Mark Christopher Walker, M.D.
Psychiatry Physician · Chicago, IL
Mark Christopher Walker, M.D. is a psychiatry physician with a practice address in Chicago, Illinois, and NPI 1265561724, issued on Mar 2, 2007. Check the license (Illinois 36-063569, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark Christopher Walker
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 36-063569 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1 E Wacker Dr, Chicago, IL 60601
- Phone
- (312) 908-7878
- Enumerated
- Mar 2, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (630) 655-0728
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,147 in Illinois → Look up another NPI →
Also registered at 1 E Wacker Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Christopher Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 36-063569Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average psychiatry physician in 2024
114 Medicare Part D claims for 13 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Sertraline Hcl20 claims
- Escitalopram Oxalate18 claims
- Bupropion Xl14 claims
- Lorazepam12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $107.73
1 payment: food and beverage; the largest payer was Tolmar, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Christopher Walker among 2,147 psychiatry physician records in Illinois
Mark Christopher Walker, M.D. is one of 2,147 psychiatry physician records with a practice address in Illinois. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 35% of them.
- NPI issued2007 · 35% of these records are older, 50% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 41% of these records are
- Record last updated2007 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
841 psychiatry physician records list a practice address in Chicago
They are 841 of the 63,379 NPPES records with a practice address in Chicago, and 2,147 psychiatry physician records in Illinois.
All 2,147 in Illinois → Every provider in Chicago → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Suzanne Cooperman, M.D.Chicago, IL 606011720144231
- Emily Forcade, M.D.Chicago, IL 606011518909753
- Paula Fuqua, M.D.Chicago, IL 606011528122736
- Samuel Goldman, M.D.Chicago, IL 606011407893159
- Richard Harris, M.D.Chicago, IL 606011285701276
- Fredric Levy, M.D.Chicago, IL 606011659373165
- Mojgan Makki, MDChicago, IL 606011366428328
- Radmila Manev, M.D.Chicago, IL 606011447363601
Common questions
What is Mark Christopher Walker, M.D.'s NPI number?
Mark Christopher Walker, M.D.'s National Provider Identifier (NPI) is 1265561724, issued on Mar 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark Christopher Walker, M.D. located?
The NPPES record lists a practice address at 1 E Wacker Dr, Chicago, IL, 60601. Phone: (312) 908-7878. Providers update this record themselves, so call before visiting.
How can I verify Mark Christopher Walker, M.D.'s license?
NPPES lists Illinois license number 36-063569, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Christopher Walker, M.D. prescribe under Medicare Part D?
In 2024, Mark Christopher Walker, M.D. had 114 Medicare Part D claims for 13 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.