AMMAR HASSAN D.O.
NPI 1023428877
Internal Medicine - Gastroenterology in Munster, IN

Q: What is Ammar Hassan's NPI number?

The NPI number for Ammar Hassan is 1023428877. It was assigned to this individual provider in the NPPES registry on May 2, 2014.

Q: What is Ammar Hassan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Ammar Hassan was last updated on December 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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 May 02, 2014PECOS EnrolledAccepts Medicare Assignment

9410 CALUMET AVE STE 401, MUNSTER, IN 46321(219) 922-4900(219) 836-9922 Get Directions Write a Review

NPPES record last updated: December 15, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 15, 2025, Mar 18, 2025, Aug 13, 2024 and 2 more (5 updates tracked since 2021).

On this page

About Ammar Hassan D.o. NPPES

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

AMMAR HASSAN D.O. (NPI 1023428877) is an individual gastroenterology provider in Munster, Indiana, licensed in Indiana (2005989A) and active in the NPI registry since May 2014. He is enrolled in Medicare PECOS, is affiliated with Presence Saint Joseph Medical Center, and maintains a secondary practice location in Romeoville.

NPPES Registry Identity

NPI1023428877

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameAMMAR HASSANCredential: D.O.

Location Address9410 CALUMET AVE STE 401Munster, IN 46321-0018

Mailing Address9410 Calumet Ave Ste 401Munster, IN 46321-0018 · (219) 922-4900 · Fax (219) 836-9922

Phone(219) 922-4900

Fax(219) 836-9922

Sole ProprietorNo

Medical School CMSMidwestern University, Chicago College Of Osteopathic MedGraduated 2014

Enumeration DateMay 2, 2014

Last NPPES UpdateDecember 15, 20255 updates tracked since enumeration

NPPES CertifiedDecember 15, 2025

✔ NPI 1023428877 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

Licenses✔ Licensed in IN · 2005989A✔ Licensed in IL · 036153911

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedInternal MedicineTaxonomy 207R00000X · License 02005989A (IN), 036153911 (IL)

9410 CALUMET AVE STE 401, Munster, IN 46321

Open in Google Maps ↗

Secondary Practice Location 1

Location 1500 S Weber RdRomeoville, IL 60446-6528 · Phone (815) 773-7732

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.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

Ammar Hassan D.o. 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 ID1951607506

PECOS Enrollment IDI20200717000675, I20260120002065

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 Ammar Hassan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Dalal Medical Corporation

Same address

Gastroenterology

9410 CALUMET AVE STE 401
Munster, IN 46321

Reassigned Medicare billing, Indiana enrollment
17 clinicians in this Medicare group

NPI 1720024615 (219) 922-4900

The Methodist Hospitals, Inc

3.0 mi

Gastroenterology

600 RICHARD GORDON HATCHER BLVD
Gary, IN 46402

Reassigned Medicare billing, Indiana enrollment
201 clinicians in this Medicare group

NPI 1326614991 (219) 886-4000

Prime Healthcare Illinois Medical Group LLC

39 mi

Multi-Specialty

2380 E DEMPSTER ST
Des Plaines, IL 60016

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

NPI 1023837689 (833) 291-0464

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 15

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.

221 services142 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.

133 services117 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.

125 services92 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

118 services115 patients

Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231

Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.

103 services100 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

100 services91 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

95 services93 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

91 services91 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.

77 services74 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

60 services60 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

27 services27 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

23 services23 patients

Control of bleeding of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43255

This procedure involves using a flexible tube with a light, called an endoscope, to examine and treat bleeding in the esophagus, stomach, or upper small bowel. It's a safe, effective way to control bleeding and ensure your digestive health.

16 services16 patients

Insertion of stomach tube using a flexible endoscope 43246

This procedure involves the use of a flexible endoscope, a thin tube with a light and camera, to insert a stomach tube. It helps doctors view and access your stomach without surgery. It's typically performed under sedation to ensure comfort.

14 services14 patients

Control of bleeding of upper large bowel using a flexible endoscope 45382

This procedure involves using a flexible endoscope, a thin tube with a light and camera, to view and control bleeding in the upper large bowel. Special tools can be passed through the endoscope to stop the bleeding. It's a minimally invasive way to address this issue.

12 services12 patients

Hospital Affiliations CMS Care Compare 5

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

Presence Saint Joseph Medical Center

Acute Care Hospitals · Joliet, IL

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number140007

Location333 N Madison StJoliet, IL 60435 · Will County

Emergency services Birthing friendly

Presence Mercy Medical Center

Acute Care Hospitals · Aurora, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140174

Location1325 N Highland AvenueAurora, IL 60506 · Kane County

Emergency services Birthing friendly

Methodist Hospitals Inc

Acute Care Hospitals · Gary, IN

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150002

Location600 Grant StGary, IN 46402 · Lake County

Emergency services Birthing friendly

Franciscan Health Dyer

Acute Care Hospitals · Dyer, IN

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number150090

Location24 Joliet StDyer, IN 46311 · Lake County

Emergency services Birthing friendly

Franciscan Health Munster

Acute Care Hospitals · Munster, IN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150165

Location701 Superior AveMunster, IN 46321 · Lake County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 46321 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

$122.49 typical visit price

range $53.07 – $161.76

Typical copayment $30.62 (range $13.26 – $40.44)

Most-billed visit code 99204

Established Patient

$94.22 typical visit price

range $16.93 – $132.22

Typical copayment $23.55 (range $4.23 – $33.05)

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 9

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

MRS. AMARA DONELLA DICKERSON APN

Nurse Practitioner (Acute Care)