Doctor profile · Federal record
Dr. Helen Chang, MD
Internal Medicine Physician · Mission Viejo, CA
- NPI 1639134687
- 20 yrs on file
- Female
- No sanctions
Practice & contact
- Primary practice
-
25982 Pala, Suite 250
Mission Viejo, CA 926916719
(949) 588-0051
fax (949) 588-0052
Credentials & registration
- NPI registered
- April 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A65088
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1639134687. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
65
Distinct HCPCS
3
Medicare allowed
$8,082
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 30 | 25 | $139 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 24 | 21 | $99 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 11 | 11 | $140 |
In context: peer comparison
Among 22 peers in this city , average services per provider: 176. This provider delivers 0.4× the peer median.Open Payments
Industry payments received
All-time total
$146
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Amgen Inc. | 1 | $146.24 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
735
Patients
155
Total drug cost
$11,665
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 113 | 36 | $1,526 |
| Amlodipine Besylate | Generic | 92 | 26 | $818 |
| Levothyroxine Sodium | Generic | 72 | 18 | $1,587 |
| Losartan Potassium | Generic | 67 | 18 | $1,071 |
| Lisinopril | Generic | 49 | 14 | $394 |
| Zolpidem Tartrate | Generic | 49 | 0 | $158 |
| Omeprazole | Generic | 45 | 16 | $614 |
| Gabapentin | Generic | 43 | 13 | $455 |
| Rosuvastatin Calcium | Generic | 43 | 14 | $2,242 |
| Metoprolol Succinate | Generic | 31 | 0 | $1,277 |
Frequently asked questions
What is Dr. Helen Chang's medical specialty?
Dr. Helen Chang practices Internal Medicine Physician in Mission Viejo, CA.
Where does Dr. Helen Chang practice?
Dr. Helen Chang practices at 25982 Pala, Mission Viejo, CA 926916719. Office phone: 9495880051.
What is Dr. Helen Chang's NPI?
Dr. Helen Chang's National Provider Identifier (NPI) is 1639134687, issued by NPPES.
What procedures does Dr. Helen Chang commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.