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DR. GREGORY R OLSON M.D.
NPI 1326428103
Internal Medicine - Infectious Disease in Palos Heights, IL

Active since June 05, 2015PECOS EnrolledAccepts Medicare Assignment
75/100
CMS Quality Rating
7804 W COLLEGE DR STE 1NW, PALOS HEIGHTS, IL 60463(708) 361-5778 Get Directions Write a Review

NPPES record last updated: December 23, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 23, 2021, Jun 29, 2021 (2 updates tracked since 2021).

About Dr. Gregory R Olson M.d. NPPES

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

DR. GREGORY R OLSON M.D. (NPI 1326428103) is an individual infectious disease provider in Palos Heights, Illinois, licensed in Illinois (036.146290) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with Advocate Christ Hospital & Medical Center, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2015).

NPPES Registry Identity

NPI1326428103
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. GREGORY R OLSONCredential: M.D.
Location Address7804 W COLLEGE DR STE 1NWPalos Heights, IL 60463-1025
Mailing Address7804 W College Dr Ste 1nwPalos Heights, IL 60463-1025
Phone(708) 361-5778
Sole ProprietorNo
Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 2015
Enumeration DateJune 5, 2015
Last NPPES UpdateDecember 23, 20212 updates tracked since enumeration
NPPES CertifiedDecember 23, 2021
✔ NPI 1326428103 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in IL · 036.146290
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License 264177 (MA)
7804 W COLLEGE DR STE 1NW, Palos Heights, IL 60463
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, Oscar Health.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. Gregory R Olson 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.

PECOS PAC ID4385952886
PECOS Enrollment IDI20200507000263
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

2

Medicare enrollment records show Gregory Olson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Southwest Infectious Disease & Internal Medicine S C
Same address
Infectious Disease
7804 W COLLEGE DR, SUITE 1NW
Palos Heights, IL 60463
  • Reassigned Medicare billing, Illinois enrollment
  • 12 clinicians in this Medicare group
NPI 1447337548 (708) 361-5778
The University Of Chicago Medical Center
13 mi
General Acute Care Hospital
5841 S MARYLAND AVE
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 1,905 clinicians in this Medicare group
NPI 1033218128 (773) 702-1530

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 6

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
1,481 services338 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
132 services118 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
62 services30 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
61 services60 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.
26 services23 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
25 services18 patients

Hospital Affiliations CMS Care Compare 2

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

Advocate Christ Hospital & Medical Center

Acute Care Hospitals · Oak Lawn, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140208
Location4440 W 95th StreetOak Lawn, IL 60453 · Cook County
Emergency services Birthing friendly

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140242
Location25 North Winfield RoadWinfield, IL 60190 · Du Page County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60463 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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

75/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice

Other Providers at the Same Location NPPES

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

ANKUR B DAVE D.O
Internal Medicine (Infectious Disease)
7804 W COLLEGE DR STE 1NW
PALOS HEIGHTS, IL 60463
Cook County (708) 361-5778

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 Gregory Olson's NPI number?

The NPI number for Gregory Olson is 1326428103. It was assigned to this individual provider in the NPPES registry on June 5, 2015.

Where is Gregory Olson located?

Gregory Olson practices at 7804 W College Dr Ste 1nw, Palos Heights, IL 60463. The listed phone number is (708) 361-5778.

What is Gregory Olson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Gregory Olson enrolled in Medicare?

Yes. Gregory Olson 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 Gregory Olson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Olson reassigns Medicare benefits to 2 organizations: Southwest Infectious Disease & Internal Medicine S C (Palos Heights, IL) and The University Of Chicago Medical Center (Chicago, IL). 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 Gregory Olson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Olson accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Gregory Olson 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 Gregory Olson affiliated with any hospitals?

According to CMS data, Gregory Olson is affiliated with Advocate Christ Hospital & Medical Center and Northwestern Medicine Central Dupage Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Olson was last updated on December 23, 2021. 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.