Doctor profile · Federal record
Dr. Ronald Markos, MD
Gastroenterology Physician (CMS: Gastroenterology) · Sellersville, PA
- NPI 1851399786
- Accepts Medicare
- 38 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
817 Lawn Ave
Sellersville, PA 189601549
(215) 257-5071
fax (215) 257-1801
Credentials & registration
- NPI registered
- July 2005 — 21 yrs on file
- Profile last updated
- April 27, 2012
- Year of graduation
- 1988 — 38 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Pennsylvania #MD041987L
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1851399786. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,923
Distinct HCPCS
10
Medicare allowed
$284,933
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 381 | 331 | $91 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 246 | 244 | $259 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 176 | 162 | $129 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 169 | 155 | $122 | |
46221 |
Removal of external hemorrhoids by rubber banding | 127 | 68 | $302 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 122 | 122 | $186 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 117 | 117 | $115 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 100 | 100 | $172 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 86 | 47 | $81 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 84 | 80 | $102 |
In context: peer comparison
Among 6 peers in Sellersville Gastroenterology Physician, average services per provider: 73. This provider delivers 26× the peer median.Open Payments
Industry payments received
All-time total
$714
Transactions
38
Manufacturers
14
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 20 | $371.98 | |
| Celgene Corporation | 3 | $53.23 | |
| Phathom Pharmaceuticals, INC. | 3 | $50.95 | |
| Takeda Pharmaceuticals U.S.A., INC. | 2 | $36.02 | |
| Janssen Biotech, INC. | 1 | $31.40 | |
| Lilly USA, LLC | 1 | $21.95 | |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | 1 | $21.62 | |
| Ironwood Pharmaceuticals, INC | 1 | $21.28 | |
| Celltrion USA INC. | 1 | $21.27 | |
| Boehringer Ingelheim Pharmaceuticals, INC. | 1 | $19.70 | |
| Genzyme Corporation | 1 | $19.27 | |
| CapsoVision, INC. | 1 | $18.24 | |
| Gilead Sciences, INC. | 1 | $15.49 | |
| Endogastric Solutions, INC | 1 | $11.58 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,731
Patients
445
Total drug cost
$329,684
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Famotidine | Generic | 767 | 225 | $17,532 |
| Omeprazole | Generic | 454 | 115 | $3,915 |
| Pantoprazole Sodium | Generic | 191 | 49 | $5,791 |
| Mesalamine | Generic | 56 | 11 | $33,298 |
| Colestipol Hcl | Generic | 38 | 11 | $3,780 |
| Dicyclomine Hcl | Generic | 30 | 14 | $820 |
| Humira(Cf) Pen (Adalimumab) | Brand | 27 | 0 | $208,959 |
| Spironolactone | Generic | 25 | 0 | $392 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 23 | 20 | $401 |
| Vemlidy (Tenofovir Alafenamide) | Brand | 23 | 0 | $37,106 |
Hospital affiliations
Frequently asked questions
What is Dr. Ronald Markos's medical specialty?
Dr. Ronald Markos practices Gastroenterology Physician in Sellersville, PA.
Where does Dr. Ronald Markos practice?
Dr. Ronald Markos practices at 817 Lawn Ave, Sellersville, PA 189601549. Office phone: 2152575071.
What is Dr. Ronald Markos's NPI?
Dr. Ronald Markos's National Provider Identifier (NPI) is 1851399786, issued by NPPES.
Does Dr. Ronald Markos accept Medicare assignment?
Yes. Dr. Ronald Markos accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ronald Markos commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.