Timothy Zisman, MD, MPH
NPI 1427213461 · Gastroenterology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Zisman, MD, MPH is a Gastroenterology Physician provider in Seattle, WA (NPI 1427213461).
Provider details
- NPI number
- 1427213461
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH
- Sex
- Male
- Sole proprietor
- No
- License
- MD60078007 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
304 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) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 104 | $263 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 46 | $105 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 44 | $194 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 40 | $99 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 25 | $9 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High Risk |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetron Hcl | 201 | 195 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 89 | 88 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 59 | 59 |
| Mesalamine | 42 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 36 | 35 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 33 | 33 |
| Omeprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$139 across 2 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
- 2008-07-18
- Last updated
- 2019-08-09
Frequently asked questions
- What is Timothy Zisman's NPI number?
- Timothy Zisman's National Provider Identifier (NPI) is 1427213461, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Zisman's specialty?
- Timothy Zisman is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Zisman located?
- Timothy Zisman's practice location on file with NPPES is 1100 9th Ave, Seattle, WA 98101-2756.
- What is Timothy Zisman's phone number?
- The practice phone number listed in the NPPES registry for Timothy Zisman is (206) 223-2319.
- Does Timothy Zisman accept Medicare?
- Timothy Zisman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Zisman's NPI active?
- Yes — Timothy Zisman's NPI (1427213461) is active in the NPPES registry as of the last update on 2019-08-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.