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DR. MOHAMMED S. SIDDIQUI MD
NPI 1639456122
Psychiatry & Neurology - Geriatric Psychiatry in Lombard, IL

Active since November 10, 2011PECOS EnrolledAccepts Medicare Assignment
477 E BUTTERFIELD RD STE 102, LOMBARD, IL 60148(630) 528-3835(630) 528-3837 Get Directions Write a Review

NPPES record last updated: November 20, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 20, 2025, Aug 23, 2017 (2 updates tracked since 2017).

About Dr. Mohammed S. Siddiqui Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MOHAMMED S. SIDDIQUI MD (NPI 1639456122) is an individual geriatric psychiatry provider in Lombard, Illinois, licensed in Illinois (036-131386) and active in the NPI registry since November 2011. He is enrolled in Medicare PECOS, is affiliated with Rush Oak Park Hospital, and is a graduate of Other (1997).

NPPES Registry Identity

NPI1639456122
Entity TypeIndividualMale
Primary Taxonomy2084P0805X
Provider Legal NameDR. MOHAMMED S. SIDDIQUICredential: MD
Location Address477 E BUTTERFIELD RD STE 102Lombard, IL 60148-4880
Mailing Address477 E Butterfield Rd Ste 102Lombard, IL 60148-4880 · (630) 528-3835 · Fax (630) 528-3837
Phone(630) 528-3835
Fax(630) 528-3837
Sole ProprietorYes
Medical School CMSOtherGraduated 1997
Enumeration DateNovember 10, 2011
Last NPPES UpdateNovember 20, 20252 updates tracked since enumeration
NPPES CertifiedNovember 20, 2025
✔ NPI 1639456122 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Geriatric PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0805X
License✔ Licensed in IL · 036-131386
Definition
Geriatric Psychiatry is a subspecialty with psychiatric expertise in prevention, evaluation, diagnosis and treatment of mental and emotional disorders in the elderly, and improvement of psychiatric care for healthy and ill elderly patients.
477 E BUTTERFIELD RD STE 102, Lombard, IL 60148
Open in Google Maps ↗

Other Identifiers 1

Medicaid036131386IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, Anthem Blue Cross and Blue Shield and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mohammed S. Siddiqui Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8729224720
PECOS Enrollment IDI20130417000630
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

9

Medicare enrollment records show Mohammed Siddiqui reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

S S Behavioral Health Inc
0.1 mi
Geriatric Psychiatry
477 E BUTTERFIELD RD STE 102
Lombard, IL 60148
  • Reassigned Medicare billing, Illinois enrollment
  • 2 clinicians in this Medicare group
NPI 1801313721 (630) 528-3835
Edward Health Ventures
2.2 mi
Clinic/Center
4 E OGDEN AVE
Westmont, IL 60559
  • Reassigned Medicare billing, Illinois enrollment
  • 561 clinicians in this Medicare group
NPI 1275903494 (331) 221-2810
Rush University Medical Center
4.1 mi
Internal Medicine
2011 YORK ROAD, 2ND FLOOR
Oak Brook, IL 60523
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Rush University Medical Group
  • 2,169 clinicians in this Medicare group
NPI 1801375696 (630) 724-1310
City Of Hope Medical Group Of Illinois PLLC
43 mi
Specialist
2520 ELISHA AVE
Zion, IL 60099
  • Reassigned Medicare billing, Illinois enrollment
  • 253 clinicians in this Medicare group
NPI 1548258072 (847) 746-4358
Ottawa Regional Hospital & Healthcare Center
54 mi
General Acute Care Hospital
1100 E NORRIS DR
Ottawa, IL 61350
  • Reassigned Medicare billing, Illinois enrollment
  • 130 clinicians in this Medicare group
NPI 1306971080 (815) 433-3100
Osf Multi-Specialty Group
113 mi
Internal Medicine
8600 N STATE ROUTE 91
Peoria, IL 61615
  • Reassigned Medicare billing, Illinois enrollment
  • 2,944 clinicians in this Medicare group
NPI 1154908929 (309) 683-5050
Siu Physicians & Surgeons, Inc
165 mi
Endocrinology, Diabetes & Metabolism
201 E MADISON ST STE 328
Springfield, IL 62702
  • Reassigned Medicare billing, Illinois enrollment
  • 645 clinicians in this Medicare group
NPI 1558385989 (217) 545-8000
St. Mary's Hospital, Centralia, Illinois
236 mi
Anesthesiology
400 N PLEASANT AVE
Centralia, IL 62801
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: St Marys Hospital Centralia Illinois
  • 392 clinicians in this Medicare group
NPI 1477097871 (618) 436-6056
Physician Services Corporation Of Southern Illinois Inc.
248 mi
Internal Medicine
4218 LINCOLNSHIRE DR
Mount Vernon, IL 62864
  • Reassigned Medicare billing, Illinois enrollment
  • 296 clinicians in this Medicare group
NPI 1831101807 (618) 899-3600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
240 services82 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
161 services66 patients
Psychiatric diagnostic evaluation with medical services 90792
A psychiatric diagnostic evaluation with medical services is a comprehensive assessment. It includes a detailed examination of your mental health and physical wellbeing, as well as your personal and family history. This evaluation aids in creating an effective treatment plan.
29 services29 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Rush Oak Park Hospital

Acute Care Hospitals · Oak Park, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140063
Location520 S Maple AveOak Park, IL 60304 · Cook County
Emergency services

Osf Saint Elizabeth Mdl Ctr

Acute Care Hospitals · Ottawa, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140110
Location1100 E Norris DriveOttawa, IL 61350 · La Salle County
Emergency services Birthing friendly

Rush University Medical Center

Acute Care Hospitals · Chicago, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140119
Location1653 West Congress ParkwayChicago, IL 60612 · Cook County
Emergency services Birthing friendly

Elmhurst Memorial Hospital

Acute Care Hospitals · Elmhurst, IL
4/5 CMS rating
OwnershipProprietary
CMS Certification Number140200
Location155 East Brush Hill RoadElmhurst, IL 60126 · Du Page County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60148 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$181.38 typical visit price
range $59.81 – $181.38
Typical copayment $45.34 (range $14.95 – $45.34)
Most-billed visit code 99205
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Filter, disposable, used with positive airway pressure device A7038
DME-Other DME · category DE001N
1 supplier12 claims72 services$1.75 avg. paid by Medicare
Continuous positive airway pressure (cpap) device E0601
DME-Other DME · category DE001N
1 supplier29 claims29 services$28.45 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. CHRISTINA LYZYN PSYD
Clinical Neuropsychologist
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 424-8900
CAROL A CREWS LCSW
Social Worker (Clinical)
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 424-8900
CHELSEA COOPER
Psychologist (Clinical)
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 424-8900
S S BEHAVIORAL HEALTH INC
Psychiatry & Neurology (Geriatric Psychiatry)
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 528-3835
MR. RANDALL WARREN SUMMERVILLE PSYD
Psychologist (Clinical)
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 424-8900
GREGORY MALO PSYD & ASSOCIATES IN NEUROPSYCHOLOGY PC
Clinic/Center (Adult Mental Health)
477 E BUTTERFIELD RD STE 102
LOMBARD, IL 60148
Dupage County (630) 424-8900

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mohammed Siddiqui's NPI number?

The NPI number for Mohammed Siddiqui is 1639456122. It was assigned to this individual provider in the NPPES registry on November 10, 2011.

Where is Mohammed Siddiqui located?

Mohammed Siddiqui practices at 477 E Butterfield Rd Ste 102, Lombard, IL 60148. The listed phone number is (630) 528-3835.

What is Mohammed Siddiqui's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Geriatric Psychiatry, with taxonomy code 2084P0805X.

Is Mohammed Siddiqui enrolled in Medicare?

Yes. Mohammed Siddiqui is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mohammed Siddiqui's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mohammed Siddiqui reassigns Medicare benefits to 9 organizations: S S Behavioral Health Inc (Lombard, IL), Edward Health Ventures (Westmont, IL), Rush University Medical Center (Oak Brook, IL), City Of Hope Medical Group Of Illinois PLLC (Zion, IL), Ottawa Regional Hospital & Healthcare Center (Ottawa, IL) and 4 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mohammed Siddiqui's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mohammed Siddiqui accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Anthem Blue Cross and Blue Shield, Oscar Health and Priority Health list Mohammed Siddiqui as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mohammed Siddiqui affiliated with any hospitals?

According to CMS data, Mohammed Siddiqui is affiliated with Rush Oak Park Hospital, Osf Saint Elizabeth Mdl Ctr, Rush University Medical Center and Elmhurst Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Mohammed Siddiqui was last updated on November 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.