AHMAD OSAMA REZ M.D
NPI 1356537179
Hospitalist in Alton, IL

Q: What is Ahmad Rez's NPI number?

The NPI number for Ahmad Rez is 1356537179. It was assigned to this individual provider in the NPPES registry on September 16, 2007.

Q: What is Ahmad Rez's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Q: When was this NPI record last updated?

The NPPES record for Ahmad Rez was last updated on September 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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 September 16, 2007PECOS EnrolledAccepts Medicare Assignment

1 SAINT ANTHONYS WAY, ALTON, IL 62002(314) 317-0600(314) 317-0606 Get Directions Write a Review

NPPES record last updated: September 19, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 19, 2025, Oct 8, 2019 (2 updates tracked since 2019).

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About Ahmad Osama Rez M.d NPPES

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

AHMAD OSAMA REZ M.D (NPI 1356537179) is an individual hospitalist provider in Alton, Illinois, licensed in Illinois (036.131216) and active in the NPI registry since September 2007. He is enrolled in Medicare PECOS, is affiliated with Ssm St Clare Health Center, and maintains a secondary practice location in Belleville.

NPPES Registry Identity

NPI1356537179

Entity TypeIndividualMale

Primary Taxonomy208M00000X

Provider Legal NameAHMAD OSAMA REZCredential: M.D

Location Address1 SAINT ANTHONYS WAYAlton, IL 62002-4568

Mailing Address12101 Woodcrest Executive Dr, Suite 210Saint Louis, MO 63141-5047 · (314) 317-0600 · Fax (314) 317-0606

Phone(314) 317-0600

Fax(314) 317-0606

Sole ProprietorNo

Medical School CMSOtherGraduated 2003

Enumeration DateSeptember 16, 2007

Last NPPES UpdateSeptember 19, 20252 updates tracked since enumeration

NPPES CertifiedSeptember 19, 2025

✔ NPI 1356537179 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians

Taxonomy Code208M00000X

Licenses✔ Licensed in IL · 036.131216✔ Licensed in MO · 2010014085✔ Licensed in IL · 036131216

Definition

Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.

Also ListedInternal MedicineTaxonomy 207R00000X · License 036.131216 (IL)

1 SAINT ANTHONYS WAY, Alton, IL 62002

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Secondary Practice Location 1

Location 14500 Memorial DrBelleville, IL 62226-5360 · Phone (618) 257-6220

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

Ahmad Osama Rez 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 ID1951435510

PECOS Enrollment IDI20100818000219, I20210129001153

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

Medicare enrollment records show Ahmad Rez reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Cep America - Illinois Hospitalists, LLP

Same address

Internal Medicine

1 SAINT ANTHONYS WAY
Alton, IL 62002

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

NPI 1164973947 (618) 465-2571

Fairview Heights Medical Group, Sc

25 mi

Internal Medicine

670 MASON RIDGE CENTER DR, STE 300
Saint Louis, MO 63141

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

NPI 1811392210 (314) 996-7644

Physician Groups Lc

25 mi

Multi-Specialty

670 MASON RIDGE CENTER DR STE 300
Saint Louis, MO 63141

Reassigned Medicare billing, Missouri enrollment
611 clinicians in this Medicare group

NPI 1285664268 (314) 996-7644

Galen Inpatient Physicians PC.

31 mi

Hospitalist

1015 BOWLES AVE
Fenton, MO 63026

Reassigned Medicare billing, Missouri and California enrollments
Also billed through NPI 1316037021 (California)
93 clinicians in this Medicare group

NPI 1538714688 (636) 496-2000

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 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.

643 services204 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

230 services215 patients

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.

217 services101 patients

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

32 services26 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.

24 services23 patients

Advance care planning, first 30 minutes 99497

Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.

11 services11 patients

Hospital Affiliations CMS Care Compare 2

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

Ssm St Clare Health Center

Acute Care Hospitals · Fenton, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260081

Location1015 BowlesFenton, MO 63026 · Jefferson County

Emergency services Birthing friendly

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260108

Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62002 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

$131.14 typical visit price

range $56.28 – $173.35

Typical copayment $32.78 (range $14.07 – $43.33)

Most-billed visit code 99204

Established Patient

$99.71 typical visit price

range $17.51 – $139.99

Typical copayment $24.92 (range $4.37 – $34.99)

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 4

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

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

3 suppliers15 claims19 services$14.89 avg. paid by Medicare

Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466

DME-Other DME · category DE005N

1 supplier12 claims12 services$859.99 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

3 suppliers25 claims25 services$66.78 avg. paid by Medicare

Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738

DME-Oxygen and Supplies · category DC000N

2 suppliers12 claims12 services$34.03 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 20

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

IBRAHIM B.I. ELAYYAN MD

Hospitalist