NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1386722643 MD
Verify on CMS → David Tanaka, MD
Internal Medicine Physician in Denver, Colorado.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in 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
4K
Medicare Part D claims · 577 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
David Tanaka, MD filed 4,013 Medicare Part D claims in 2023 as an Internal Medicine Physician in Denver, Colorado, prescribing 88% generic.
- 4K
- Part D claims, 2023
- 88%
- 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.
David Tanaka, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,013 Top 8% higher than 92% 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)
David Tanaka, MD 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 David Tanaka, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
4,013 48% vs specialty avg
Specialty distribution in Colorado
How Internal Medicine Physician compares to other specialties among Colorado 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 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).
David Tanaka, MD appears in the CMS NPPES registry as an Internal Medicine Physician provider holding MD credentials at 8111 E LOWRY BLVD, Denver, CO, 80230, with a listed phone of (720) 848-9500. NPI 1386722643 was issued on 11/02/2006.
Medicare Part D records for calendar year 2023 show 4,013 prescription claims written by this provider, covering 577 Medicare beneficiaries and totaling roughly $432K in drug spend, split 11% brand-name and 88% generic by claim count, with an opioid prescribing rate of 5.7%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1386722643 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/02/2006 |
Hospital and facility affiliations
Facilities where David Tanaka, 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.
University Physicians Incorporated
Aurora, CO
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
David Tanaka, MD - brand share 11.0%
Internal Medicine Physician average
11% brand-name claims vs 88% generic, on 4,013 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.
4,013
Total Claims
$432K
Total Drug Cost
577
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 9,615
- Total Day Supply
- 282,243
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $330K
- Generic Drug Cost
- $101K
- Opioid Claims
- 230 (5.7% rate)
- Antibiotic Claims
- 53
Patient Demographics
- Average Patient Age
- 71.9 years
- Avg HCC Risk Score
- 1.40
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 69, 65-74: 308, 75-84: 156, 85+: 44
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What David Tanaka, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
358 claims
- Lisinopril
Lisinopril
173 claims
- Omeprazole
Omeprazole
168 claims
- Levothyroxine Sodium 140
Levothyroxine Sodium
140 claims
- Amlodipine Besylate 113
Amlodipine Besylate
113 claims
- Tamsulosin Hcl 109
Tamsulosin Hcl
109 claims
- Losartan Potassium 103
Losartan Potassium
103 claims
- Zolpidem Tartrate 88
Zolpidem Tartrate
88 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 358 |
| Lisinopril | 173 |
| Omeprazole | 168 |
| Levothyroxine Sodium | 140 |
| Amlodipine Besylate | 113 |
| Tamsulosin Hcl | 109 |
| Losartan Potassium | 103 |
| Zolpidem Tartrate | 88 |
| Rosuvastatin Calcium | 84 |
| Oxycodone Hcl | 64 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How David Tanaka, MD fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
David Tanaka, MD's 4,013 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Tanaka.
Dr. Emily Aaron
MD
Denver, CO
Dr. Cynthia Abacan
MD
Pueblo, CO
Dr. David Abbey
MS MD
Fort Collins, CO
Dr. Ahmed Abdulrahman
MD
Pueblo, CO
Dr. Victor Abela
D.O.
Denver, CO
Compare Internal 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 Colorado medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal 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.
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Frequently Asked Questions
What is David Tanaka, MD's specialty? ▼
David Tanaka, MD specializes in Internal Medicine Physician and practices in Denver, Colorado. Credentials: MD.
How much does David Tanaka, MD prescribe under Medicare Part D? ▼
In 2023, David Tanaka, MD wrote 4,013 Medicare Part D claims totaling $432K in drug costs for 577 beneficiaries.
Where is David Tanaka, MD located? ▼
David Tanaka, MD is located at 8111 E LOWRY BLVD, Denver, CO, 80230. Phone: (720) 848-9500.
What is David Tanaka, MD's NPI number? ▼
David Tanaka, MD's National Provider Identifier (NPI) is 1386722643, issued on 11/02/2006.
Does David Tanaka, MD prescribe more brand-name or generic drugs? ▼
David Tanaka, MD's prescribing is 11% brand-name and 88% generic drugs by claim count, with $330K in brand drug costs.
Does David Tanaka, MD prescribe opioids? ▼
Yes, David Tanaka, MD had 230 opioid claims in 2023 with an opioid prescribing rate of 5.7%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does David Tanaka, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, David Tanaka, MD's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Tanaka, MD accept Medicare? ▼
David Tanaka, MD appears in CMS Medicare data with 4,013 Part D claims and 577 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Tanaka, MD's credentials? ▼
David Tanaka, MD's NPI is 1386722643 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
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 May 2026.