What is Alan Chang's NPI number?

Alan Chang's National Provider Identifier (NPI) is 1255398285, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Alan Chang's specialty?

Alan Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).

Where is Alan Chang located?

Alan Chang's practice location on file with NPPES is 3111 Woburn St Ste 201, Bellingham, WA 98226-6610.

What is Alan Chang's phone number?

The practice phone number listed in the NPPES registry for Alan Chang is (360) 543-5054.

Does Alan Chang accept Medicare?

Alan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Alan Chang's NPI active?

Yes — Alan Chang's NPI (1255398285) is active in the NPPES registry as of the last update on 2023-05-24.

IndividualActiveAccepts Medicare

Alan Chang, M.D.

NPI 1255398285 · Gastroenterology Physician · Bellingham, WA

Alan Chang, M.D. is a Gastroenterology Physician provider in Bellingham, WA (NPI 1255398285).

Provider details

NPI number: 1255398285
Entity type: Individual
Primary specialty: Gastroenterology PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: No
License: MD00036498 (WA)

Practice location

3111 Woburn St Ste 201

Bellingham, WA 98226-6610

Phone: (360) 543-5054

Fax: (360) 733-1659

Street-level locationGet directions

More WA providers

Mailing address

3111 Woburn St Ste 201

Bellingham, WA 98226-6610

Specialties & taxonomies

Gastroenterology PhysicianPrimary207RG0100XLicense MD00036498 (WA)
Allopathic & Osteopathic Physicians

Additional practice locations (1)

1342 Ne Medical Center Dr Ste 100
Bend, OR 97701-5918
Phone: (541) 706-5777
Fax: (541) 429-6642

Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Established profile(74/100 index)

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
2 documented practice locations
Medicare service volume (vs. specialty peers)25% of score
94 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 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)
Biopsy of Large Bowel Using a Flexible Endoscope45380	39	$53
Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385	34	$229
Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239	21	$51

Typical Medicare-allowed amounts for these services range $51–$229 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 5 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G	55	55
Pantoprazole Sodium	45	16
Omeprazole	26	13
Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes	15	15
Sucralfate	13	—

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$15 across 1 record (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.

Enumerated: 2006-04-26
Last updated: 2023-05-24
Certified: 2023-05-24

Frequently asked questions

What is Alan Chang's NPI number?: Alan Chang's National Provider Identifier (NPI) is 1255398285, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Alan Chang's specialty?: Alan Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
Where is Alan Chang located?: Alan Chang's practice location on file with NPPES is 3111 Woburn St Ste 201, Bellingham, WA 98226-6610.
What is Alan Chang's phone number?: The practice phone number listed in the NPPES registry for Alan Chang is (360) 543-5054.
Does Alan Chang accept Medicare?: Alan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Alan Chang's NPI active?: Yes — Alan Chang's NPI (1255398285) is active in the NPPES registry as of the last update on 2023-05-24.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

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)

Biopsy of Large Bowel Using a Flexible Endoscope45380

$53

Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385

$229

Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239

$51

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G	55	55
Pantoprazole Sodium	45	16
Omeprazole	26	13
Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes	15	15
Sucralfate	13	—

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$15 across 1 record (Open Payments 2024)

Provider details

Practice location

Mailing address

Specialties & taxonomies

Additional practice locations (1)

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Additional practice locations (1)

Frequently asked questions

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments