Larry Johnston, D.O.
NPI 1386036333 · Gastroenterology Physician · Ames, IA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Larry Johnston, D.O. is a Gastroenterology Physician provider in Ames, IA (NPI 1386036333).
Provider details
- NPI number
- 1386036333
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 05983 (IA)
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
11 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,116 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) |
|---|---|---|
| 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 | 340 | $5 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 125 | $228 |
| 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 | 85 | $15 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 57 | $84 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 222 | 219 |
| Omeprazole | 183 | 61 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 51 | 51 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 26 | 26 |
| Nortriptyline Hcl | 18 | — |
| Sulfasalazine | 17 | — |
| Famotidine | 17 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$574 across 21 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
Registry dates
- Enumerated
- 2015-02-28
- Last updated
- 2022-08-02
- Certified
- 2022-08-02
Frequently asked questions
- What is Larry Johnston's NPI number?
- Larry Johnston's National Provider Identifier (NPI) is 1386036333, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Larry Johnston's specialty?
- Larry Johnston is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Larry Johnston located?
- Larry Johnston's practice location on file with NPPES is 1215 Duff Ave, Ames, IA 50010-5469.
- What is Larry Johnston's phone number?
- The practice phone number listed in the NPPES registry for Larry Johnston is (515) 239-4450.
- Does Larry Johnston accept Medicare?
- Larry Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Larry Johnston's NPI active?
- Yes — Larry Johnston's NPI (1386036333) is active in the NPPES registry as of the last update on 2022-08-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.