Glenn Littenberg, M.D.
NPI 1033184973 · Gastroenterology Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Glenn Littenberg, M.D. is a Gastroenterology Physician provider in Pasadena, CA (NPI 1033184973).
Provider details
- NPI number
- 1033184973
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G27849 (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
20 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
2,149 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) |
|---|---|---|
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99439 | 814 | $52 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 452 | $67 |
| 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 | 210 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 162 | $134 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 97 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 239 | 78 |
| Pantoprazole Sodium | 158 | 56 |
| Famotidine | 72 | 26 |
| Dicyclomine Hcl | 56 | 16 |
| Mesalamine | 46 | 12 |
| Peg3350/Sod Sul/Nacl/Kcl/Asb/Cbrand: Plenvu | 40 | 40 |
| Linaclotidebrand: Linzess | 36 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$19,391 across 153 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
- 2006-02-22
- Last updated
- 2008-04-18
Frequently asked questions
- What is Glenn Littenberg's NPI number?
- Glenn Littenberg's National Provider Identifier (NPI) is 1033184973, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Glenn Littenberg's specialty?
- Glenn Littenberg is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Glenn Littenberg located?
- Glenn Littenberg's practice location on file with NPPES is 630 S Raymond Ave, Pasadena, CA 91105-3278.
- What is Glenn Littenberg's phone number?
- The practice phone number listed in the NPPES registry for Glenn Littenberg is (626) 449-9920.
- Does Glenn Littenberg accept Medicare?
- Glenn Littenberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Glenn Littenberg's NPI active?
- Yes — Glenn Littenberg's NPI (1033184973) is active in the NPPES registry as of the last update on 2008-04-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.