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Physician

MARK JOHNSTON, MD

Gastroenterology

LANCASTER, PA, 17601
NPI: 1003898131

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Gastroenterology

LANCASTER, PA

Hospital Affiliations

Search procedure prices at these hospitals only · all code types (Gastroenterology & related)

Common Procedures for Gastroenterology

ColonoscopyUpper Endoscopy (EGD)Capsule EndoscopyLiver BiopsyERCPHemorrhoid BandingPolyp RemovalEsophageal DilationPEG Tube PlacementFibroScan

Based on specialty. Actual services may vary — contact the provider's office to confirm.

Procedure Pricing (Medicare Data)

Based on CMS Medicare Provider Utilization data for 2023. These represent what this physician charged Medicare, not necessarily what you would pay. Compare with other physicians

ProcedureAvg ChargeMedicare AllowedMedicare PaidServices
45385
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
$1,025$236$19677
45380
Biopsy of large bowel using a flexible endoscope
$875$116$92117
G0105
Colorectal cancer screening; colonoscopy on individual at high risk
$750$166$16620
43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
$645$81$6566
43235
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope
$530$80$6514
43249
Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm
$440$122$8814
99204
New patient office or other outpatient visit, 45-59 minutes
$410$160$10435
96413
Administration of chemotherapy into vein, 1 hour or less
$300$119$9522
99214
Established patient office or other outpatient visit, 30-39 minutes
$270$121$8885
99203
New patient office or other outpatient visit, 30-44 minutes
$270$107$8119
96365
Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less
$227$59$4716
43450
Dilation of esophagus
$210$36$2916
99213
Established patient office or other outpatient visit, 20-29 minutes
$185$86$6687
J1745
Injection, infliximab, excludes biosimilar, 10 mg
$115$32$251,400
96415
Administration of chemotherapy into vein, each additional hour
$100$26$2122
J3380
Injection, vedolizumab, 1 mg
$47$22$174,500

Compare prices for procedures performed by Gastroenterology physicians

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Physician identity data from the NPPES NPI Registry. Last synced 3/28/2026.