Jason Haas, DO - Medicare Gastroenterology in Chesterfield, MO

Jason Haas, DO is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Chesterfield, Missouri. He went to At Still University Of Health Sciences, College Of Osteo Med, Kirksville and graduated in 2008 and has 16 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice Gateway Gastroenterology Inc and his current practice location is 1008 Greystone Manor Pkwy, Chesterfield, Missouri. You can reach out to his office (for appointments etc.) via phone at (608) 780-1566.

Jason Haas is licensed to practice in Missouri (license number 2014006550) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1790948008.

Contact Information

Jason Haas, DO
1008 Greystone Manor Pkwy,
Chesterfield, MO 63005-4941
(608) 780-1566
Not Available

Map and Direction




Physician's Profile

Full NameJason Haas
GenderMale
SpecialityGastroenterology
Experience16 Years
Location1008 Greystone Manor Pkwy, Chesterfield, Missouri
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Jason Haas attended and graduated from At Still University Of Health Sciences, College Of Osteo Med, Kirksville in 2008
  NPI Data:
  • NPI Number: 1790948008
  • Provider Enumeration Date: 07/07/2008
  • Last Update Date: 12/08/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 8022232883
  • Enrollment ID: I20140617002213

Medical Identifiers

Medical identifiers for Jason Haas such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1790948008NPI-NPPES
1790948008MedicaidMO
200015314MedicaidMO

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology 2014006550 (Missouri)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
St Lukes HospitalChesterfield, MOHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Gateway Gastroenterology Inc266844871310

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Jason Haas allows following entities to bill medicare on his behalf.
Entity NameGateway Gastroenterology Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1043250400
PECOS PAC ID: 2668448713
Enrollment ID: O20040909000422
Entity NameLester E Cox Medical Centers
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1174952212
PECOS PAC ID: 1658509864
Enrollment ID: O20140115001602

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Jason Haas is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Jason Haas, DO
1008 Greystone Manor Pkwy,
Chesterfield, MO 63005-4941

Ph: () -
Jason Haas, DO
1008 Greystone Manor Pkwy,
Chesterfield, MO 63005-4941

Ph: (608) 780-1566

Reviews and Comments


Internal Medicine Doctors in Chesterfield, MO

Lovepreet Singh Randhawa, MD
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Medicare: Not Enrolled in Medicare
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Phone: 314-205-6050    Fax: 314-205-6350
Rachel Lynn Fishman Oiknine, M.D.
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Practice Location: 222 S Woods Mill Rd, Suite 410n, Chesterfield, MO 63017
Phone: 314-469-6224    Fax: 314-469-0744
Xiaoling Wu, MD
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Practice Location: 224 S Woods Mill Rd, Suite 370 South, Chesterfield, MO 63017
Phone: 314-878-2460    
Daniel B Bauwens, MD
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Medicare: Medicare Enrolled
Practice Location: 232 S Woods Mill Rd, Chesterfield, MO 63017
Phone: 314-576-5023    
Michael Carl Fusco, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 14528 S Outer 40, Suite 300, Chesterfield, MO 63017
Phone: 314-214-8100    Fax: 314-214-8233
David H Cort, M.D.
Gastroenterology
Medicare: Medicare Enrolled
Practice Location: 226 S Woods Mill Rd, Suite 52 West, Chesterfield, MO 63017
Phone: 314-434-2399    Fax: 314-434-5653
Meghashyam Jayateerth Koti, MD
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 15740 S Outer 40 Rd # C, Chesterfield, MO 63017
Phone: 636-735-4963    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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