Larissa Allen, M.D.
NPI 1659536480 · Gastroenterology Physician · Tucson, AZ
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Larissa Allen, M.D. is a Gastroenterology Physician provider in Tucson, AZ (NPI 1659536480).
Provider details
- NPI number
- 1659536480
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 48787 (AZ)
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,282 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 221 | $82 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 192 | $101 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 190 | $220 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 154 | $99 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 141 | $115 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 382 | 130 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 363 | 359 |
| Pantoprazole Sodium | 307 | 97 |
| Famotidine | 128 | 47 |
| Sucralfate | 95 | 56 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 94 | 92 |
| Dicyclomine Hcl | 57 | 27 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,093 across 53 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
- 2008-07-21
- Last updated
- 2017-01-05
Frequently asked questions
- What is Larissa Allen's NPI number?
- Larissa Allen's National Provider Identifier (NPI) is 1659536480, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Larissa Allen's specialty?
- Larissa Allen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Larissa Allen located?
- Larissa Allen's practice location on file with NPPES is 6130 N La Cholla Blvd, Tucson, AZ 85741-3557.
- What is Larissa Allen's phone number?
- The practice phone number listed in the NPPES registry for Larissa Allen is (520) 219-8342.
- Does Larissa Allen accept Medicare?
- Larissa Allen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Larissa Allen's NPI active?
- Yes — Larissa Allen's NPI (1659536480) is active in the NPPES registry as of the last update on 2017-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.