1. Home
  2. Directory
  3. Missouri
  4. Saint Louis
  5. Internal Medicine
  6. NPI Profile

JASON JOHN GASS D.O.
NPI 1700224201
Internal Medicine in Saint Louis, MO

Active since June 06, 2013PECOS EnrolledAccepts Medicare Assignment
621 S NEW BALLAS RD STE 7018B, SAINT LOUIS, MO 63141(314) 251-4949(314) 251-4368 Get Directions Write a Review

NPPES record last updated: September 4, 2018. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 4, 2018, Aug 2, 2018, Jul 16, 2016 (3 updates tracked since 2016).

About Jason John Gass D.o. NPPES

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

JASON JOHN GASS D.O. (NPI 1700224201) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2018022314) and active in the NPI registry since June 2013. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Other (2013).

NPPES Registry Identity

NPI1700224201
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJASON JOHN GASSCredential: D.O.
Location Address621 S NEW BALLAS RD STE 7018BSaint Louis, MO 63141
Mailing Address621 S New Ballas Rd Ste 7018bSaint Louis, MO 63141-8256 · (314) 251-4949 · Fax (314) 251-4368
Phone(314) 251-4949
Fax(314) 251-4368
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateJune 6, 2013
Last NPPES UpdateSeptember 4, 20183 updates tracked since enumeration
✔ NPI 1700224201 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in MO · 2018022314✔ Licensed in IA · DO-04881
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
621 S NEW BALLAS RD STE 7018B, Saint Louis, MO 63141
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Home State Health, Ambetter from Sunflower Health Plan and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Jason John Gass 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 ID7012151020
PECOS Enrollment IDI20181006000244
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.

Areas of Expertise CMS Part B claims 4

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.
480 services117 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.
194 services146 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.
71 services49 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.
16 services16 patients

Hospital Affiliations CMS Care Compare

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

Mercy Hospital St Louis

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260020
Location615 New Ballas RoadSaint Louis, MO 63141 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
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 2

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

DR. FREDERICK MATTHEW KUHLMANN MD
Internal Medicine (Infectious Disease)
621 S NEW BALLAS RD STE 7018B
SAINT LOUIS, MO 63141
St. Louis County (314) 251-4949
HAMZAH MOHD M.D.,
Internal Medicine (Infectious Disease)
621 S NEW BALLAS RD STE 7018B
SAINT LOUIS, MO 63141
St. Louis County (314) 251-4949

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 Jason Gass's NPI number?

The NPI number for Jason Gass is 1700224201. It was assigned to this individual provider in the NPPES registry on June 6, 2013.

Where is Jason Gass located?

Jason Gass practices at 621 S New Ballas Rd Ste 7018B, Saint Louis, MO 63141. The listed phone number is (314) 251-4949.

What is Jason Gass's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Jason Gass enrolled in Medicare?

Yes. Jason Gass 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.

What insurance does Jason Gass accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Home State Health and Ambetter from Sunflower Health Plan and 3 other insurers list Jason Gass 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 Jason Gass affiliated with any hospitals?

According to CMS data, Jason Gass is affiliated with Mercy Hospital St Louis.

When was this NPI record last updated?

The NPPES record for Jason Gass was last updated on September 4, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.