George Kunnackal John, M.D., MSC
Gastroenterology · Internal Medicine (CMS) · Baltimore, MD
At a glance
22 S Greene St, Baltimore, MD 21201-1544
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated Jun 30, 2025. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
22 S Greene StBaltimore, MD 21201-1544
Additional reported practice locations
100 West Rd Ste 115Towson, MD 212042358
Phone: 4104940144
Fax: 4104940147 700 Geipe Rd
Catonsville, MD 212284147
Phone: 4107532255
Fax: 4102424404 7625 Maple Lawn Blvd Ste 110
Fulton, MD 207592565
Phone: 3014905025
Fax: 3014905260 515 S Tollgate Rd Ste 100
Bel Air, MD 210145251
Phone: 4436433050
Fax: 4436431692 5890 Waterloo Rd
Columbia, MD 210452617
Phone: 6672142100
Fax: 4107999097 827 Linden Ave
Baltimore, MD 212014606
Phone: 4103288730
Fax: 4103288315 800 Linden Ave Fl 9
Baltimore, MD 212014622
Phone: 4105522539
Fax: 4102558415
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2010
- CMS specialties
- Gastroenterology · Internal Medicine
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- University Of Maryland Medical Center Baltimore, MD
- University Of Md Medical Center Midtown Campus Baltimore, MD
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 53 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 50 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $817.21 |
Reporting companies
| Company | Amount |
|---|---|
| JANSSEN BIOTECH, INC. | $324.73 |
| ARDELYX, INC. | $104.86 |
| TAKEDA PHARMACEUTICALS U.S.A., INC. | $95.73 |
| PFIZER INC. | $76.58 |
| ABBVIE INC. | $71.97 |
| INTERCEPT PHARMACEUTICALS, INC. | $68.22 |
| MADRIGAL PHARMACEUTICALS | $35.31 |
| SALIX PHARMACEUTICALS, A DIVISION OF BAUSCH HEALTH US, LLC | $21.47 |
| Other reporting companies | $18.34 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology · Internal Medicine (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- Jun 21, 2012
- Record updated
- Jun 30, 2025
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D., MSC
Reported taxonomies and licenses
207R00000X
License reported: D84345 MD
207RG0100X · Primary
License reported: D84345 MD
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
22 S Greene StBaltimore, MD 21201-1544
- Phone
- (410) 328-5780
- Fax
- (410) 328-8315
Mailing address
920 ELKRIDGE LANDING RDLINTHICUM, MD 210902917
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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