MAHWISH H SAIM M.D.
NPI 1649767997
Internal Medicine - Pulmonary Disease in Winfield, IL
About Mahwish H Saim M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAHWISH H SAIM M.D. (NPI 1649767997) is an individual pulmonary disease provider in Winfield, Illinois, licensed in Illinois (036174037) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Mchenry, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 3
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
Mahwish H Saim M.d. 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.
Medicare Billing Reassignment
Medicare enrollment records show Mahwish Saim reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 1,664 clinicians in this Medicare group
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Medicine Mchenry
Acute Care Hospitals · Mchenry, ILNorthwestern Lake Forest Hospital
Acute Care Hospitals · Lake Forest, ILNorthwestern Medicine Delnor Community Hospital
Acute Care Hospitals · Geneva, ILNorthwestern Medicine Central Dupage Hospital
Acute Care Hospitals · Winfield, ILNorthwestern Medicine Kishwaukee Hospital
Acute Care Hospitals · Dekalb, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60190 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WINFIELD, IL 60190
WINFIELD, IL 60190
WINFIELD, IL 60190
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 Mahwish Saim's NPI number?
The NPI number for Mahwish Saim is 1649767997. It was assigned to this individual provider in the NPPES registry on April 21, 2018. The provider is also known as Mahwish Hussain M.D..
Where is Mahwish Saim located?
Mahwish Saim practices at 25 N Winfield Rd Ste 204, Winfield, IL 60190. The listed phone number is (630) 232-0202.
What is Mahwish Saim's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.
Is Mahwish Saim enrolled in Medicare?
Yes. Mahwish Saim 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 organization bills Medicare for Mahwish Saim's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mahwish Saim reassigns Medicare benefits to Central Dupage Physician Group (Carol Stream, IL). The 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 Mahwish Saim's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mahwish Saim affiliated with any hospitals?
According to CMS data, Mahwish Saim is affiliated with Northwestern Medicine Mchenry, Northwestern Lake Forest Hospital, Northwestern Medicine Delnor Community Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Medicine Kishwaukee Hospital.
When was this NPI record last updated?
The NPPES record for Mahwish Saim was last updated on October 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days 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.
# Mahwish H Saim, M.D. · NPI 1649767997
Pulmonary Disease physician in Winfield, Illinois. Individual provider, active in the CMS NPPES registry since April 21, 2018.
## Identity
- **NPI:** 1649767997 (Entity type: Individual)
- **Enumerated:** April 21, 2018
- **Primary specialty:** Internal Medicine - Pulmonary Disease · taxonomy 207RP1001X
- **State license:** 036174037 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 25 N WINFIELD RD STE 204, Winfield, IL 60190-1379
- **Phone:** (630) 232-0202 · **Fax:** (630) 690-2293
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Central Dupage Physician Group (NPI 1033149844, Carol Stream, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** October 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1649767997) · Data from the CMS NPPES public registry.