Doctor profile · Federal record
Dr. William Chapin, MD
Endocrinology, Diabetes & Metabolism Physician (CMS: Endocrinology) · Family Medicine Physician · Portland, OR
- NPI 1083653679
- Accepts Medicare
- MIPS 87.8 / 100 · 2023
- 28 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
10101 Se Main St, Suite 1001
Portland, OR 972162455
(503) 255-3404 - Mailing address
-
Po Box 92900
Portland, OR 972920900
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- December 27, 2012
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RE0101X — NUCC code
- State license (1)
- Oregon #MD22016
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1083653679. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
216
Distinct HCPCS
6
Medicare allowed
$24,310
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99204 |
New patient office or other outpatient visit, 45-59 minutes | 73 | 73 | $168 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 59 | 39 | $131 | |
83036 |
Hemoglobin a1c level | 30 | 18 | $10 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 24 | 23 | $91 | |
99451 |
Telephone, internet, or electronic health record assessment and management with written report by consulting physician, at least 5 minutes | 18 | 18 | $36 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 12 | 12 | $101 |
In context: peer comparison
Among 22 peers in this city , average services per provider: 84. This provider delivers 2.6× the peer median.Open Payments
Industry payments received
All-time total
$28
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Dexcom, Inc. | 1 | $27.88 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
565
Patients
250
Total drug cost
$154,003
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Levothyroxine Sodium | Generic | 137 | 70 | $2,656 |
| Alendronate Sodium | Generic | 58 | 24 | $432 |
| Methimazole | Generic | 53 | 26 | $770 |
| Jardiance (Empagliflozin) | Brand | 44 | 20 | $60,368 |
| Metformin Hcl | Generic | 39 | 23 | $577 |
| Lantus Solostar (Insulin Glargine,hum.Rec.Anlog) | Brand | 36 | 23 | $30,035 |
| Metformin Hcl Er (Metformin Hcl) | Brand | 33 | 21 | $665 |
| Synthroid (Levothyroxine Sodium) | Brand | 28 | 16 | $3,475 |
| Humalog Kwikpen U-100 (Insulin Lispro) | Brand | 24 | 12 | $17,338 |
| Atorvastatin Calcium | Generic | 23 | 0 | $256 |
Hospital affiliations
Frequently asked questions
What is Dr. William Chapin's medical specialty?
Dr. William Chapin practices Endocrinology, Diabetes & Metabolism Physician in Portland, OR.
Where does Dr. William Chapin practice?
Dr. William Chapin practices at 10101 Se Main St, Portland, OR 972162455. Office phone: 5032553404.
What is Dr. William Chapin's NPI?
Dr. William Chapin's National Provider Identifier (NPI) is 1083653679, issued by NPPES.
Does Dr. William Chapin accept Medicare assignment?
Yes. Dr. William Chapin accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Chapin commonly perform?
Top Medicare-reported procedures in 2023: New patient office or other outpatient visit (HCPCS 99204); Established patient office or other outpatient visit (HCPCS 99214); Hemoglobin a1c level (HCPCS 83036). Source: CMS Medicare Physician & Other Practitioners file.