NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1336196724 MD
Verify on CMS → Mark Bubak, MD
Allergy & Immunology (Internal Medicine) Physician in Sioux Falls, South Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 517 in Allergy & Immunology (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
927
Medicare Part D claims · 141 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
46%
generic claims · 54% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
79.6/100
▼ 4 pts below national avg 83.1 · Above neutral
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
Mark Bubak, MD reported a CMS MIPS final score of 79.6/100 - below the 83.1 national average - and filed 927 Medicare Part D claims in 2023.
- 79.6/100
- MIPS score · -4 vs avg
- 927
- Part D claims, 2023
- 46%
- 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.
Mark Bubak, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
80 30th percentile higher than 30% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Mark Bubak, MD sits
This provider among allergy & immunology (internal medicine) physician peers
Across the 130 allergy & immunology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Bubak, MD writes more Part D claims than 76% of them and scores higher on MIPS quality than 48% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one allergy & immunology (internal medicine) physician peer from a representative sample of 60; the gold marker is Mark Bubak, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Bubak, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Mark Bubak, MD?
Near national averagePrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
927 16% vs specialty avg
MIPS final score
79.6/100 3.5 pts vs avg
Specialty distribution in South Dakota
How Allergy & Immunology (Internal Medicine) Physician compares to other specialties among South Dakota providers
Medicare quality performance, MIPS
Mark Bubak, MD's 2023 MIPS final score plotted against the Allergy & Immunology (Internal Medicine) Physician national average
- MIPS Final Score
- 79.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Allergy & Immunology (Internal Medicine) Physician) - 79.6/100 vs national avg 83.1
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).
Mark Bubak, MD appears in the CMS NPPES registry as an Allergy & Immunology (Internal Medicine) Physician provider holding MD credentials at 2200 W 49TH ST STE 104, Sioux Falls, SD, 57105, with a listed phone of (605) 336-6385. NPI 1336196724 was issued on 05/30/2006.
Medicare Part D records for calendar year 2023 show 927 prescription claims written by this provider, covering 141 Medicare beneficiaries and totaling roughly $1.2 million in drug spend, split 54% brand-name and 46% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 79.6/100 for the 2023 performance year (Quality 83.9, Cost 49.7), compared with the national average of 83.1.
Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 517 enrolled providers across 47 states and an average of 798 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 | 1336196724 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/30/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.5985
Final Score
Avg: 83.1
83.9127
Quality
49.7489
Cost
98
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Bubak, 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.
Dakota Allergy And Asthma Ltd
Sioux Falls, SD
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 · Brand-heavy
Mark Bubak, MD - brand share 54.0%
Allergy & Immunology (Internal Medicine) Physician average
54% brand-name claims vs 46% generic, on 927 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.
927
Total Claims
$1.2M
Total Drug Cost
141
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,239
- Total Day Supply
- 34,451
- Brand vs Generic
- 54% brand / 46% generic
- Brand Drug Cost
- $1.1M
- Generic Drug Cost
- $32K
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 70.1 years
- Avg HCC Risk Score
- 0.89
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Bubak, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Montelukast Sodium
Montelukast Sodium
162 claims
- Breo Ellipta
Breo Ellipta
76 claims
- Trelegy Ellipta
Trelegy Ellipta
70 claims
- Hizentra 59
Hizentra
59 claims
- Famotidine 57
Famotidine
57 claims
- Symbicort 57
Symbicort
57 claims
- Prednisone 51
Prednisone
51 claims
- Advair Diskus 47
Advair Diskus
47 claims
| Drug | Claims |
|---|---|
| Montelukast Sodium | 162 |
| Breo Ellipta Fluticasone/Vilanterol | 76 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 70 |
| Hizentra Immun Glob G(Igg)/Pro/Iga 0-50 | 59 |
| Famotidine | 57 |
| Symbicort Budesonide/Formoterol Fumarate | 57 |
| Prednisone | 51 |
| Advair Diskus Fluticasone Propion/Salmeterol | 47 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 40 |
| Fluticasone Propionate | 36 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Allergy & Immunology (Internal Medicine) Physician in SD →
All providers in South Dakota →
Compare specialties →
Allergy & Immunology (Internal Medicine) Physician Overview
How Mark Bubak, MD fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
517
Allergy & Immunology (Internal Medicine) Physician Providers in US
47
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
Mark Bubak, MD's 927 claims are above the specialty average of 798.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Bubak.
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 South Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Allergy & Immunology (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 Mark Bubak, MD's specialty? ▼
Mark Bubak, MD specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Sioux Falls, South Dakota. Credentials: MD.
How much does Mark Bubak, MD prescribe under Medicare Part D? ▼
In 2023, Mark Bubak, MD wrote 927 Medicare Part D claims totaling $1.2M in drug costs for 141 beneficiaries.
What is Mark Bubak, MD's Medicare quality score? ▼
Mark Bubak, MD has a CMS MIPS Final Score of 79.6/100 (Quality: 83.9, Cost: 49.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Bubak, MD located? ▼
Mark Bubak, MD is located at 2200 W 49TH ST STE 104, Sioux Falls, SD, 57105. Phone: (605) 336-6385.
What is Mark Bubak, MD's NPI number? ▼
Mark Bubak, MD's National Provider Identifier (NPI) is 1336196724, issued on 05/30/2006.
Does Mark Bubak, MD prescribe more brand-name or generic drugs? ▼
Mark Bubak, MD's prescribing is 54% brand-name and 46% generic drugs by claim count, with $1.1M in brand drug costs.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 517 Allergy & Immunology (Internal Medicine) Physician providers across 47 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does Mark Bubak, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Bubak, MD's most frequently prescribed drugs include Montelukast Sodium, Breo Ellipta, Trelegy Ellipta. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Bubak, MD accept Medicare? ▼
Mark Bubak, MD appears in CMS Medicare data with 927 Part D claims and 141 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Bubak, MD's credentials? ▼
Mark Bubak, MD's NPI is 1336196724 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.
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.