NPI registry status
Active
2026 NPPES data Otolaryngology Physician NPI 1477549210 M.D.
Verify on CMS → Mark Zlab, M.D.
Otolaryngology Physician in West Des Moines, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,893 in Otolaryngology 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
391
Medicare Part D claims · 139 beneficiaries · Otolaryngology Physician avg: 509
Generic prescribing
97%
generic claims · 3% 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
Mark Zlab, M.D. filed 391 Medicare Part D claims in 2023 as an Otolaryngology Physician in West Des Moines, Iowa, prescribing 97% generic.
- 391
- Part D claims, 2023
- 97%
- generic prescribing
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 Zlab, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
391 Top 43% higher than 57% 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-eligible specialty (heuristic, not verified)
Mark Zlab, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Zlab, M.D.?
Quality data not reportedPrimary specialty
Otolaryngology Physician
Medicare Part D claims
391 23% vs specialty avg
Specialty distribution in Iowa
How Otolaryngology Physician compares to other specialties among Iowa 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 Otolaryngology 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).
Mark Zlab, M.D. appears in the CMS NPPES registry as an Otolaryngology Physician provider holding M.D. credentials at 5950 UNIVERSITY AVE, West Des Moines, IA, 50266, with a listed phone of (515) 875-9450. NPI 1477549210 was issued on 09/27/2005.
Medicare Part D records for calendar year 2023 show 391 prescription claims written by this provider, covering 139 Medicare beneficiaries and totaling roughly $15K in drug spend, split 3% brand-name and 97% generic by claim count.
Otolaryngology Physician is a mid-sized specialty nationwide, with 10,893 enrolled providers across 54 states and an average of 509 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 | 1477549210 |
|---|---|
| Specialty | Otolaryngology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/27/2005 |
Brand vs generic prescribing mix · Generic-heavy
Mark Zlab, M.D. - brand share 3.0%
Otolaryngology Physician average
3% brand-name claims vs 97% generic, on 391 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.
391
Total Claims
$15K
Total Drug Cost
139
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 500
- Total Day Supply
- 11,612
- Brand vs Generic
- 3% brand / 97% generic
- Brand Drug Cost
- $1K
- Generic Drug Cost
- $14K
- Antibiotic Claims
- 65
Patient Demographics
- Average Patient Age
- 71.6 years
- Avg HCC Risk Score
- 1.20
- Gender Split
- 59% female / 41% 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 Zlab, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
61 claims
- Azelastine Hcl
Azelastine Hcl
53 claims
- Fluticasone Propio…
Fluticasone Propionate
44 claims
- Ipratropium Bromide
Ipratropium Bromide
37 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
30 claims
- Montelukast Sodium 21
Montelukast Sodium
21 claims
- Tobramycin-Dexamet… 19
Tobramycin-Dexamethasone
19 claims
- Methylprednisolone 18
Methylprednisolone
18 claims
| Drug | Claims |
|---|---|
| Omeprazole | 61 |
| Azelastine Hcl | 53 |
| Fluticasone Propionate | 44 |
| Ipratropium Bromide | 37 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 30 |
| Montelukast Sodium | 21 |
| Tobramycin-Dexamethasone Tobramycin/Dexamethasone | 19 |
| Methylprednisolone | 18 |
| Epinephrine | 15 |
| Prednisone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Otolaryngology Physician Overview
How Mark Zlab, M.D. fits within the Otolaryngology Physician landscape nationally.
10,893
Otolaryngology Physician Providers in US
54
States with Otolaryngology Physician
509
Avg Claims per Provider
Mark Zlab, M.D.'s 391 claims are below the specialty average of 509.
Nearby Otolaryngology Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Zlab.
Dr. Mohannad Al-Qudah
M.D.
Iowa City, IA
Dr. Ahmed Alkhateeb
MD
Iowa City, IA
Dr. Ghassan Alokby
M.D.
Iowa City, IA
Dr. Alhanouf Alqabbani
MD
Iowa City, IA
Dr. Louis Alt
M.D.
Dubuque, IA
Compare Otolaryngology 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 Iowa medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Otolaryngology 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
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Iowa
Frequently Asked Questions
What is Mark Zlab, M.D.'s specialty? ▼
Mark Zlab, M.D. specializes in Otolaryngology Physician and practices in West Des Moines, Iowa. Credentials: M.D..
How much does Mark Zlab, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Zlab, M.D. wrote 391 Medicare Part D claims totaling $15K in drug costs for 139 beneficiaries.
Where is Mark Zlab, M.D. located? ▼
Mark Zlab, M.D. is located at 5950 UNIVERSITY AVE, West Des Moines, IA, 50266. Phone: (515) 875-9450.
What is Mark Zlab, M.D.'s NPI number? ▼
Mark Zlab, M.D.'s National Provider Identifier (NPI) is 1477549210, issued on 09/27/2005.
Does Mark Zlab, M.D. prescribe more brand-name or generic drugs? ▼
Mark Zlab, M.D.'s prescribing is 3% brand-name and 97% generic drugs by claim count, with $1K in brand drug costs.
How many Otolaryngology Physician providers are there in the US? ▼
There are 10,893 Otolaryngology Physician providers across 54 states in the US. The average Otolaryngology Physician provider writes 509 Medicare Part D claims per year.
What drugs does Mark Zlab, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Zlab, M.D.'s most frequently prescribed drugs include Omeprazole, Azelastine Hcl, Fluticasone Propionate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Zlab, M.D. accept Medicare? ▼
Mark Zlab, M.D. appears in CMS Medicare data with 391 Part D claims and 139 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Zlab, M.D.'s credentials? ▼
Mark Zlab, M.D.'s NPI is 1477549210 with credentials M.D.. 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.