NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1538335443 DO
Verify on CMS → Amber An, DO
Geriatric Medicine (Internal Medicine) Physician in Olympia, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 4,215 in Geriatric Medicine (Internal Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
2K
Medicare Part D claims · 171 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
What the federal data shows
Amber An, DO filed 1,680 Medicare Part D claims in 2024 as a Geriatric Medicine (Internal Medicine) Physician in Olympia, Washington.
- 2K
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥81st
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Amber An, DO
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1538335443), first enumerated 05/01/2008.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,680 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Washington statewide board action statistics are published annually — these figures describe aggregate state activity, not Amber An, DO's individual license status. Verify directly with the state medical board.
Source: WMC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1538335443 · Geriatric Medicine (Internal Medicine) Physician
NPI-10 · ENUM-MID · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1538335443
- ENUM-MID 2008
- TAX-NARROW 4,215
- RX-MID 1,680
- BOOK-THIN 88 in Washington
- PHOTO-ENUM Issa Hallaq, D.O. · 2008
Amber An, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,680 ≥ 81st percentile 81% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Amber An, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Amber An, DO?
Quality data not reportedPrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
1,680 62% vs specialty avg
Specialty distribution in Washington
How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Washington providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Geriatric Medicine (Internal Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1538335443 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 05/01/2008 |
Hospital and facility affiliations
Facilities where Amber An, DO bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Kaiser Foundation Health Plan OF Washington
Olympia, WA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Washington WMC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~34K Washington medical licensees in 2023 - they are NOT specific to Amber An, DO. To verify Amber An, DO's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
1,680
Total Claims
$114K
Total Drug Cost
171
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,941.9
- Total Day Supply
- 43,052
- Generic Drug Cost
- $44K
- Opioid Claims
- 32 (1.9% rate)
- Antibiotic Claims
- 92
Patient Demographics
- Average Patient Age
- 80.1 years
- Avg HCC Risk Score
- 2.63
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Amber An, DO prescribes most
Top Medicare Part D drugs by claim count, 2024
- Potassium Chloride
Potassium Chloride
92 claims
- Gabapentin
Gabapentin
83 claims
- Atorvastatin Calcium
Atorvastatin Calcium
68 claims
- Furosemide
Furosemide
63 claims
- Amlodipine Besylate
Amlodipine Besylate
55 claims
- Sertraline Hcl
Sertraline Hcl
41 claims
- Losartan Potassium
Losartan Potassium
38 claims
- Albuterol Sulfate 36
Albuterol Sulfate
36 claims
| Drug | Claims |
|---|---|
| Potassium Chloride | 92 |
| Gabapentin | 83 |
| Atorvastatin Calcium | 68 |
| Furosemide | 63 |
| Amlodipine Besylate | 55 |
| Sertraline Hcl | 41 |
| Losartan Potassium | 38 |
| Albuterol Sulfate | 36 |
| Lisinopril | 35 |
| Eliquis Apixaban | 33 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Internal Medicine) Physician in WA →
All providers in Washington →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How Amber An, DO fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.
4,215
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,420
Avg Claims per Provider
Amber An, DO's 1,680 claims are below the specialty average of 4,420.
Nationwide Geriatric Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for An, both outside Washington so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as An.
One of 88 Geriatric Medicine (Internal Medicine) Physician providers enrolled in Washington, 5 are shown here.
Frequently Asked Questions
What is Amber An, DO's specialty? ▼
Amber An, DO specializes in Geriatric Medicine (Internal Medicine) Physician and practices in Olympia, Washington. Credentials: DO.
How much does Amber An, DO prescribe under Medicare Part D? ▼
In 2024, Amber An, DO wrote 1,680 Medicare Part D claims totaling $114K in drug costs for 171 beneficiaries.
Where is Amber An, DO located? ▼
Amber An, DO is located at 700 LILLY RD NE, Olympia, WA, 98506. Phone: (360) 923-7000.
What is Amber An, DO's NPI number? ▼
Amber An, DO's National Provider Identifier (NPI) is 1538335443, issued on 05/01/2008.
Does Amber An, DO prescribe opioids? ▼
Yes, Amber An, DO had 32 opioid claims in 2024 with an opioid prescribing rate of 1.9%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,215 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,420 Medicare Part D claims per year.
What drugs does Amber An, DO prescribe most often? ▼
Based on 2024 Medicare Part D data, Amber An, DO's most frequently prescribed drugs include Potassium Chloride, Gabapentin, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Amber An, DO accept Medicare? ▼
Amber An, DO appears in CMS Medicare data with 1,680 Part D claims and 171 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Amber An, DO's credentials? ▼
Amber An, DO's NPI is 1538335443 with credentials DO. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.