Louis I. Peng, MD
Internal Medicine Physician · Battle Ground, WA
Louis I. Peng, MD is an internal medicine physician with a practice address in Battle Ground, Washington, and NPI 1831121615, issued on Jul 6, 2006. Check the license on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Louis I. Peng
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD20257 OR
Self-reported in NPPES; status is on the state search - Practice location
- 18 NW 20TH Ave, Battle Ground, WA 98604
- Phone
- (360) 952-4457
- Enumerated
- Jul 6, 2006
- Record last updated
- Feb 8, 2022
- Fax
- (360) 828-7409
- Medicaid ID
- 210837 OR
- Medicare enrollment
- Enrolled (PECOS I20200108000850); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 18 NW 20TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Linda EttlMental Health Counselor1124548490
- Heather Hodgson Kuhl, MACounselor1801451604
- Chau HuynhMedical Physician Assistant1316496011
- Matthew Oxiles, ARNPFamily Nurse Practitioner1801031737
- Brenda Roberts, M.D.Family Medicine Physician1346466323
Verify Louis I. Peng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical CommissionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,153 Medicare Part D claims for 372 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Atorvastatin Calcium196 claims
- Rosuvastatin Calcium196 claims
- Losartan Potassium152 claims
- Metoprolol Succinate101 claims
- Levothyroxine Sodium100 claims
- Gabapentin99 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Salem HealthWoodburn, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Louis I. Peng among 3,079 internal medicine physician records in Washington
Louis I. Peng, MD is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1995 · median 2006 among the 1,852 with a school on file
- Record last updated2022 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Washington
There are 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Battle Ground → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alexander Dreisin, MBBS, MDBattle Ground, WA 986041255868592
- Navin Nagaraj, MDBattle Ground, WA 986041154586238
- Megan Emad, MDCamas, WA 986071205474574
- Alma Fe Houghton, M.D.Camas, WA 986071679006852
- Jaspreet Khangura, M.D.Camas, WA 986071194983593
- John Nelson, M.D.Camas, WA 986071962510867
- Neha Patel, M.D.Camas, WA 986071811147093
- Daniel Spyker, PHD, MDCamas, WA 986071871975615
Common questions
What is Louis I. Peng, MD's NPI number?
Louis I. Peng, MD's National Provider Identifier (NPI) is 1831121615, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Louis I. Peng, MD located?
The NPPES record lists a practice address at 18 NW 20TH Ave, Battle Ground, WA, 98604. Phone: (360) 952-4457. Providers update this record themselves, so call before visiting.
How can I verify Louis I. Peng, MD's license?
Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Louis I. Peng, MD prescribe under Medicare Part D?
In 2024, Louis I. Peng, MD had 3,153 Medicare Part D claims for 372 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.