NPI registry status
Active
2026 NPPES data Adult Medicine Physician NPI 1205858123 MD
Verify on CMS → Gia Hemmen, MD
Adult Medicine Physician in Redmond, 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 2,481 in Adult 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
7K
Medicare Part D claims · 427 beneficiaries · Adult Medicine Physician avg: 3K
Generic prescribing
85%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gia Hemmen, MD filed 7,403 Medicare Part D claims in 2023 as a Adult Medicine Physician in Redmond, Washington, prescribing 85% generic.
- 7K
- Part D claims, 2023
- 85%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Gia Hemmen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
7,403 Top 3% higher than 97% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Gia Hemmen, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Gia Hemmen, MD?
Quality data not reportedPrimary specialty
Adult Medicine Physician
Medicare Part D claims
7,403 164% vs specialty avg
Specialty distribution in Washington
How Adult 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 Adult 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).
Gia Hemmen, MD appears in the CMS NPPES registry as a Adult Medicine Physician provider holding MD credentials at 18100 NE UNION HILL RD STE 200, Redmond, WA, 98052, with a listed phone of (206) 320-5190. NPI 1205858123 was issued on 07/24/2006.
Medicare Part D records for calendar year 2023 show 7,403 prescription claims written by this provider, covering 427 Medicare beneficiaries and totaling roughly $685K in drug spend, split 13% brand-name and 85% generic by claim count, with an opioid prescribing rate of 2.2%.
Adult Medicine Physician is a narrow specialty nationwide, with 2,481 enrolled providers across 52 states and an average of 2,807 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1205858123 |
|---|---|
| Specialty | Adult Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 07/24/2006 |
Hospital and facility affiliations
Facilities where Gia Hemmen, MD 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.
Swedish Health Services
Redmond, WA
Valley Medical Group-Renton
Covington, 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 Gia Hemmen, MD. To verify Gia Hemmen, MD'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.
Brand vs generic prescribing mix · Typical
Gia Hemmen, MD - brand share 13.0%
Adult Medicine Physician average
13% brand-name claims vs 85% generic, on 7,403 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
7,403
Total Claims
$685K
Total Drug Cost
427
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 14,745
- Total Day Supply
- 430,284
- Brand vs Generic
- 13% brand / 85% generic
- Brand Drug Cost
- $543K
- Generic Drug Cost
- $133K
- Opioid Claims
- 160 (2.2% rate)
- Antibiotic Claims
- 40
Patient Demographics
- Average Patient Age
- 73.2 years
- Avg HCC Risk Score
- 1.38
- Gender Split
- 73% female / 27% male
- Age Distribution
- <65: 48, 65-74: 191, 75-84: 139, 85+: 49
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gia Hemmen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
522 claims
- Levothyroxine Sodium
Levothyroxine Sodium
347 claims
- Amlodipine Besylate
Amlodipine Besylate
328 claims
- Losartan Potassium
Losartan Potassium
316 claims
- Gabapentin
Gabapentin
228 claims
- Furosemide
Furosemide
220 claims
- Lisinopril
Lisinopril
220 claims
- Omeprazole 199
Omeprazole
199 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 522 |
| Levothyroxine Sodium | 347 |
| Amlodipine Besylate | 328 |
| Losartan Potassium | 316 |
| Gabapentin | 228 |
| Furosemide | 220 |
| Lisinopril | 220 |
| Omeprazole | 199 |
| Metformin Hcl | 144 |
| Metoprolol Succinate | 140 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Adult Medicine Physician Overview
How Gia Hemmen, MD fits within the Adult Medicine Physician landscape nationally.
2,481
Adult Medicine Physician Providers in US
52
States with Adult Medicine Physician
2,807
Avg Claims per Provider
Gia Hemmen, MD's 7,403 claims are above the specialty average of 2,807.
Nearby Adult Medicine Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Hemmen.
Dr. John Allen
D.O.
Sunnyside, WA
Dr. Carla Amadei Gatti
MD
Tacoma, WA
Dr. Arunas Banionis
D.O.
Silverdale, WA
Dr. Liliane Bartha
M.D.
Olympia, WA
Dr. Rosemary Beck
M.D.
Olympia, WA
Compare Adult Medicine Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Washington medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Adult Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Gia Hemmen, MD's specialty? ▼
Gia Hemmen, MD specializes in Adult Medicine Physician and practices in Redmond, Washington. Credentials: MD.
How much does Gia Hemmen, MD prescribe under Medicare Part D? ▼
In 2023, Gia Hemmen, MD wrote 7,403 Medicare Part D claims totaling $685K in drug costs for 427 beneficiaries.
Where is Gia Hemmen, MD located? ▼
Gia Hemmen, MD is located at 18100 NE UNION HILL RD STE 200, Redmond, WA, 98052. Phone: (206) 320-5190.
What is Gia Hemmen, MD's NPI number? ▼
Gia Hemmen, MD's National Provider Identifier (NPI) is 1205858123, issued on 07/24/2006.
Does Gia Hemmen, MD prescribe more brand-name or generic drugs? ▼
Gia Hemmen, MD's prescribing is 13% brand-name and 85% generic drugs by claim count, with $543K in brand drug costs.
Does Gia Hemmen, MD prescribe opioids? ▼
Yes, Gia Hemmen, MD had 160 opioid claims in 2023 with an opioid prescribing rate of 2.2%.
How many Adult Medicine Physician providers are there in the US? ▼
There are 2,481 Adult Medicine Physician providers across 52 states in the US. The average Adult Medicine Physician provider writes 2,807 Medicare Part D claims per year.
What drugs does Gia Hemmen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gia Hemmen, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gia Hemmen, MD accept Medicare? ▼
Gia Hemmen, MD appears in CMS Medicare data with 7,403 Part D claims and 427 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gia Hemmen, MD's credentials? ▼
Gia Hemmen, MD's NPI is 1205858123 with credentials MD. 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.