ZAIN BIN AHSAN DO
NPI 1740919588
Internal Medicine in Chicago, IL

Q: What is Zain Ahsan's NPI number?

The NPI number for Zain Ahsan is 1740919588. It was assigned to this individual provider in the NPPES registry on June 7, 2022.

Q: What is Zain Ahsan's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Zain Ahsan was last updated on July 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.

Active since June 07, 2022PECOS EnrolledAccepts Medicare Assignment

1500 S FAIRFIELD AVE, CHICAGO, IL 60608(773) 542-2000 Get Directions Write a Review

NPPES record last updated: July 30, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Zain Bin Ahsan Do NPPES

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

ZAIN BIN AHSAN DO (NPI 1740919588) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (036176169) and active in the NPI registry since June 2022. He is enrolled in Medicare PECOS, is affiliated with Mt Sinai Hospital Medical Center, and maintains a secondary practice location in Sierra Vista.

NPPES Registry Identity

NPI1740919588

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameZAIN BIN AHSANCredential: DO

Location Address1500 S FAIRFIELD AVEChicago, IL 60608-1782

Mailing Address1219 Torrey Pines CtNaperville, IL 60540-1400 · (630) 386-7186

Phone(773) 542-2000

Sole ProprietorYes

Medical School CMSOtherGraduated 2022

Enumeration DateJune 7, 2022

Last NPPES UpdateJuly 30, 2025

NPPES CertifiedJuly 30, 2025

✔ NPI 1740919588 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Licenses✔ Licensed in IL · 036176169✔ Licensed in AZ · R3747

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1500 S FAIRFIELD AVE, Chicago, IL 60608

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Secondary Practice Location 1

Location 15700 AZ-90Sierra Vista, AZ 85635 · Phone (520) 263-2000

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

Zain Bin Ahsan Do 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 ID2668970682

PECOS Enrollment IDI20250808003806

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 Reassignment

Medicare enrollment records show Zain Ahsan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mount Sinai Community Foundation

Same address

Surgery

2720 W. 15TH
Chicago, IL 60608

Reassigned Medicare billing, Illinois enrollment
646 clinicians in this Medicare group

NPI 1649318148 (773) 257-6701

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

Hospital Affiliations CMS Care Compare 2

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

Mt Sinai Hospital Medical Center

Acute Care Hospitals · Chicago, IL

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140018

Location1500 S Fairfield AveChicago, IL 60608 · Cook County

Emergency services Birthing friendly

Holy Cross Hospital

Acute Care Hospitals · Chicago, IL

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140133

Location2701 W 68th StreetChicago, IL 60629 · Cook County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60608 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

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

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.

Other Providers at the Same Location NPPES 20

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

AUDREY SHAE WHITNAH

Pharmacist