Karen Sein Ohn, MD
NPI 1518119536 · Gastroenterology Physician · Granite City, IL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Sein Ohn, MD is a Gastroenterology Physician provider in Granite City, IL (NPI 1518119536).
Provider details
- NPI number
- 1518119536
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301069021 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
259 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 66 | $95 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 53 | $238 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 37 | $123 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 34 | $161 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 22 | $87 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 183 | 68 |
| Ondansetron Hcl | 48 | 38 |
| Lipase/Protease/Amylasebrand: Zenpep | 37 | — |
| Pantoprazole Sodium | 32 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 31 | 31 |
| Carvedilol | 25 | — |
| Famotidine | 23 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,154 across 50 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 100 Cherry St SeGrand RapidsGrand Rapids, MI 49503-4526Phone: (616) 965-8200Fax: (616) 940-5337
Registry dates
- Enumerated
- 2008-10-22
- Last updated
- 2021-07-14
- Certified
- 2021-07-14
Frequently asked questions
- What is Karen Sein Ohn's NPI number?
- Karen Sein Ohn's National Provider Identifier (NPI) is 1518119536, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Sein Ohn's specialty?
- Karen Sein Ohn is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Sein Ohn located?
- Karen Sein Ohn's practice location on file with NPPES is 2100 Madison Ave, Granite City, IL 62040-4713.
- What is Karen Sein Ohn's phone number?
- The practice phone number listed in the NPPES registry for Karen Sein Ohn is (618) 798-3000.
- Does Karen Sein Ohn accept Medicare?
- Karen Sein Ohn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Sein Ohn's NPI active?
- Yes — Karen Sein Ohn's NPI (1518119536) is active in the NPPES registry as of the last update on 2021-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.