ALAN J. SIMMONS MD
NPI 1083818561
Hospitalist in Mchenry, IL
About Alan J. Simmons Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALAN J. SIMMONS MD (NPI 1083818561) is an individual hospitalist provider in Mchenry, Illinois, licensed in Illinois (036136647) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Mchenry, and is a graduate of University Of Louisville School Of Medicine (2007).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 10
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
Alan J. Simmons 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.
Medicare Billing Reassignments
2Medicare enrollment records show Alan Simmons reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Nashville, TN 37203
- Reassigned Medicare billing, Tennessee enrollment
- 1,304 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.
Areas of Expertise CMS Part B claims 2
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.
Hospital Affiliations CMS Care Compare 2
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, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60050 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MCHENRY, IL 60050
MCHENRY, IL 60050
MCHENRY, IL 60050
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 Alan Simmons's NPI number?
The NPI number for Alan Simmons is 1083818561. It was assigned to this individual provider in the NPPES registry on June 11, 2007.
Where is Alan Simmons located?
Alan Simmons practices at 4309 W Medical Center Dr Mob A102, Mchenry, IL 60050. The listed phone number is (815) 338-6600.
What is Alan Simmons's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Alan Simmons enrolled in Medicare?
Yes. Alan Simmons 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 Alan Simmons's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alan Simmons reassigns Medicare benefits to 2 organizations: Northwestern Medical Faculty Foundation (Carol Stream, IL) and Saint Thomas Medical Partners (Nashville, TN). 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 Alan Simmons's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alan Simmons affiliated with any hospitals?
According to CMS data, Alan Simmons is affiliated with Northwestern Medicine Mchenry and Northwestern Lake Forest Hospital.
When was this NPI record last updated?
The NPPES record for Alan Simmons was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# Alan J. Simmons, MD · NPI 1083818561
Hospitalist physician in Mchenry, Illinois. Individual provider, active in the CMS NPPES registry since June 11, 2007.
## Identity
- **NPI:** 1083818561 (Entity type: Individual)
- **Enumerated:** June 11, 2007
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 036136647 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 4309 W MEDICAL CENTER DR, MOB A102, Mchenry, IL 60050-8419
- **Phone:** (815) 338-6600
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); Saint Thomas Medical Partners (NPI 1437194669, Nashville, TN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Louisville School Of Medicine, class of 2007
## Record status
- **NPPES last updated:** July 21, 2022
- **Other identifiers:** Other 50031519 (KY); Other 000000695031 (KY); Other P01027597 (TN); and 7 more
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Source: [NPI Profile](https://npiprofile.com/npi/1083818561) · Data from the CMS NPPES public registry.