Mark Walker, M.D.
Psychiatry Physician · Chicago, IL
Mark 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 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
- Entity
- Type 1 · individual
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 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, mostly 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.
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 841 in Chicago → All 2,147 in Illinois → Every provider in Chicago →
Other psychiatry physician records in Illinois
- Alexandra Aaronson, M.D.Chicago, IL1881937928
- Anthony Abadir, MDOak Park, IL1295312551
- Huma Abbas, M.D.Aurora, IL1609039163
- Jeff Abbott, M.D.Chicago, IL1265887509
- Kathryn AbbottChicago, IL1295537561
- Gil Abelita, MDBloomington, IL1619986551
- Dinuk Abeysekera, M.D.North Chicago, IL1366616534
- Patrick Abler, DOSpringfield, IL1770158537
- Rohit Abraham, MD, MPH, MATChicago, IL1013478932
- Richard AbramsChicago, IL1003992413
Common questions
What is Mark Walker, M.D.'s NPI number?
Mark 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 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 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 Walker, M.D. prescribe under Medicare Part D?
In 2024, Mark 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), loaded Aug 27, 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) 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 27, 2026.