Stephen Lawler Hasak, MD
Gastroenterology Physician · Saint Louis, MO
Stephen Lawler Hasak, MD is a gastroenterology physician with a practice address in Saint Louis, Missouri, and NPI 1184063562, issued on Jun 19, 2013. Check the license (Missouri 2015007987, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Stephen Lawler Hasak
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 2015007987 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (314) 747-2075
- Enumerated
- Jun 19, 2013
- Record last updated
- Jul 2, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (314) 454-5042
- Medicare enrollment
- Enrolled (PECOS I20200813000340); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 414 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jewish Hospital Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stephen Lawler Hasak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2015007987Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average gastroenterology physician in 2024
377 Medicare Part D claims for 175 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Omeprazole81 claims
- Gavilyte-C70 claims
- Creon29 claims
- Amitriptyline Hcl14 claims
- Famotidine14 claims
- Pantoprazole Sodium13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,833.95
44 payments; by number, the most common kind was food and beverage; the largest payer was Olympus Corporation of the Americas. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Albany Medical CollegeAlbany, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Lawler Hasak among 414 gastroenterology physician records in Missouri
Stephen Lawler Hasak, MD is one of 414 gastroenterology physician records with a practice address in Missouri. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 77% of them.
- NPI issued2013 · 77% of these records are older, 21% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2013 · median 2003 among the 303 with a school on file
- Record last updated2019 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Missouri
There are 414 gastroenterology physician records in Missouri.
All 414 in Missouri → Every provider in Saint Louis → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Riad Azar, MDSaint Louis, MO 631101952358970
- Chien-Huan Chen, MDSaint Louis, MO 631101588691265
- Jeffrey Crippin, MDSaint Louis, MO 631101265458574
- Nicholas Davidson, MDSaint Louis, MO 631101659397958
- Brian Dieckgraefe, MDSaint Louis, MO 631101295751428
- Jaquelyn Fleckenstein, MDSaint Louis, MO 631101386600864
- Chandra Gyawali, MDSaint Louis, MO 631101821014127
- Tariq Hassan, MDSaint Louis, MO 631101710970587
Common questions
What is Stephen Lawler Hasak, MD's NPI number?
Stephen Lawler Hasak, MD's National Provider Identifier (NPI) is 1184063562, issued on Jun 19, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Lawler Hasak, MD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (314) 747-2075. Providers update this record themselves, so call before visiting.
How can I verify Stephen Lawler Hasak, MD's license?
NPPES lists Missouri license number 2015007987, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Lawler Hasak, MD prescribe under Medicare Part D?
In 2024, Stephen Lawler Hasak, MD had 377 Medicare Part D claims for 175 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Stephen Lawler Hasak, MD's MIPS final score?
The 2023 MIPS final score is 76.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.