Rex Cheng, M.D.
NPI 1689998874 · Gastroenterology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Cheng, M.D. is a Gastroenterology Physician provider in Seattle, WA (NPI 1689998874).
Provider details
- NPI number
- 1689998874
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD60579501 (WA)
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 tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
148 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 48 | $264 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 38 | $127 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 30 | $167 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 19 | $98 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 13 | $76 |
Typical Medicare-allowed amounts for these services range $76–$264 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
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 |
|---|---|---|
| Omeprazole | 145 | 51 |
| Pantoprazole Sodium | 73 | 22 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 52 | 50 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 48 | 46 |
| Dicyclomine Hcl | 47 | 16 |
| Nortriptyline Hcl | 44 | 17 |
| Ursodiol | 36 | — |
Practice location
Mailing address
Additional practice locations (2)
- 1909 214th St Se Ste 300Bothell, WA 98021-4418Phone: (425) 412-7200Fax: (425) 412-7350
- 1959 Ne Pacific StSeattle, WA 98195-4409Phone: (206) 598-4377
Registry dates
- Enumerated
- 2010-03-17
- Last updated
- 2021-04-16
- Certified
- 2021-04-16
Frequently asked questions
- What is Rex Cheng's NPI number?
- Rex Cheng's National Provider Identifier (NPI) is 1689998874, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Cheng's specialty?
- Rex Cheng is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Cheng located?
- Rex Cheng's practice location on file with NPPES is 1101 Madison St Ste 301, Seattle, WA 98104-3599.
- What is Rex Cheng's phone number?
- The practice phone number listed in the NPPES registry for Rex Cheng is (206) 505-1300.
- Does Rex Cheng accept Medicare?
- Rex Cheng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Cheng's NPI active?
- Yes — Rex Cheng's NPI (1689998874) is active in the NPPES registry as of the last update on 2021-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.