Lisa Hertz, MD
NPI 1639237720 · Gastroenterology Physician · Los Alamitos, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lisa Hertz, MD is a Gastroenterology Physician provider in Los Alamitos, CA (NPI 1639237720).
Provider details
- NPI number
- 1639237720
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G59291 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
1,347 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 | 354 | $138 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 345 | $42 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 203 | $99 |
| Ultrasound Scan of Organ Tissue for Measuring Elasticity76981 | 82 | $119 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 61 | $122 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 215 | 69 |
| Famotidine | 145 | 50 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 59 | 58 |
| Omeprazole | 44 | 15 |
| Mesalamine | 43 | 12 |
| Lipase/Protease/Amylasebrand: Creon | 26 | — |
| Esomeprazole Magnesium | 19 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,875 across 84 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
- 2006-12-04
- Last updated
- 2025-08-13
- Certified
- 2025-08-13
Frequently asked questions
- What is Lisa Hertz's NPI number?
- Lisa Hertz's National Provider Identifier (NPI) is 1639237720, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lisa Hertz's specialty?
- Lisa Hertz is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Lisa Hertz located?
- Lisa Hertz's practice location on file with NPPES is 4772 Katella Ave, Los Alamitos, CA 90720-2600.
- What is Lisa Hertz's phone number?
- The practice phone number listed in the NPPES registry for Lisa Hertz is (562) 596-5552.
- Does Lisa Hertz accept Medicare?
- Lisa Hertz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lisa Hertz's NPI active?
- Yes — Lisa Hertz's NPI (1639237720) is active in the NPPES registry as of the last update on 2025-08-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.