Gordon Liss, MD
NPI 1669620746 · Gastroenterology Physician · Frederick, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gordon Liss, MD is a Gastroenterology Physician provider in Frederick, MD (NPI 1669620746).
Provider details
- NPI number
- 1669620746
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- C168998 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,614 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 296 | $137 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 253 | $17 |
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 208 | $5 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 185 | $91 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 118 | 115 |
| Omeprazole | 93 | 40 |
| Pantoprazole Sodium | 89 | 25 |
| Famotidine | 72 | 19 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 61 | 60 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 33 | 31 |
| Dicyclomine Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,101 across 41 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)
- 2205 Vista Way Ste 340Oceanside, CA 92054-5661Phone: (760) 704-5870Fax: (858) 404-1821
Registry dates
- Enumerated
- 2008-09-03
- Last updated
- 2021-04-06
- Certified
- 2020-11-10
Frequently asked questions
- What is Gordon Liss's NPI number?
- Gordon Liss's National Provider Identifier (NPI) is 1669620746, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gordon Liss's specialty?
- Gordon Liss is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gordon Liss located?
- Gordon Liss's practice location on file with NPPES is 310 W Ninth St, Frederick, MD 21701-4546.
- What is Gordon Liss's phone number?
- The practice phone number listed in the NPPES registry for Gordon Liss is (301) 695-6800.
- Does Gordon Liss accept Medicare?
- Gordon Liss is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gordon Liss's NPI active?
- Yes — Gordon Liss's NPI (1669620746) is active in the NPPES registry as of the last update on 2021-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.