NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1902888746 M.D.
Verify on CMS → Mark King, M.D.
Infectious Disease Physician in Boulder, 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 8,292 in Infectious Disease 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
478
Medicare Part D claims · 121 beneficiaries · Infectious Disease Physician avg: 816
Industry payments
$16.24
1 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark King, M.D. filed 478 Medicare Part D claims in 2023 as a Infectious Disease Physician in Boulder, Colorado.
- 478
- Part D claims, 2023
- 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 King, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
478 Top 38% higher than 62% 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)
Mark King, M.D. 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 Mark King, M.D.?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
478 41% vs specialty avg
Specialty distribution in Colorado
How Infectious Disease 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 Infectious Disease 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 King, M.D. appears in the CMS NPPES registry as a Infectious Disease Physician provider holding M.D. credentials at 4800 RIVERBEND RD, Boulder, CO, 80301, with a listed phone of (303) 415-8850. NPI 1902888746 was issued on 11/17/2005.
Medicare Part D records for calendar year 2023 show 478 prescription claims written by this provider, covering 121 Medicare beneficiaries and totaling roughly $124K in drug spend.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,292 enrolled providers across 54 states and an average of 816 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 | 1902888746 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 11/17/2005 |
Hospital and facility affiliations
Facilities where Mark King, M.D. 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.
Boulder Community Health
★★★★☆ 4/5
Boulder, CO
Acute Care Hospitals
CMS CCN: 060027
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mark King, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$16
Largest payer
Insmed, Inc.
Most common payment type
Education
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
478
Total Claims
$124K
Total Drug Cost
121
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 691
- Total Day Supply
- 16,298
- Generic Drug Cost
- $55K
- Antibiotic Claims
- 350
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 2.01
- Gender Split
- 56% female / 44% 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 King, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
60 claims
- Amoxicillin
Amoxicillin
32 claims
- Doxycycline Hyclate
Doxycycline Hyclate
30 claims
- Valacyclovir
Valacyclovir
26 claims
- Cefazolin Sodium
Cefazolin Sodium
25 claims
- Doxycycline Monohy…
Doxycycline Monohydrate
25 claims
- Cefadroxil 20
Cefadroxil
20 claims
- Fluconazole 16
Fluconazole
16 claims
| Drug | Claims |
|---|---|
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 60 |
| Amoxicillin | 32 |
| Doxycycline Hyclate | 30 |
| Valacyclovir Valacyclovir Hcl | 26 |
| Cefazolin Sodium | 25 |
| Doxycycline Monohydrate | 25 |
| Cefadroxil | 20 |
| Fluconazole | 16 |
| Linezolid | 16 |
| Daptomycin | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Mark King, M.D. fits within the Infectious Disease Physician landscape nationally.
8,292
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Mark King, M.D.'s 478 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as King.
Dr. Samer Alyaseen
MD
Aurora, CO
Dr. Andrew Ambler
D.O.
Denver, CO
Dr. Wendy Armstrong
MD
Aurora, CO
Dr. Sandhya Ayyar
M.D.
Aurora, CO
Dr. Wendy Bamberg
MD
Colorado Springs, CO
Compare Infectious Disease 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 Infectious Disease 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 King, M.D.'s specialty? ▼
Mark King, M.D. specializes in Infectious Disease Physician and practices in Boulder, Colorado. Credentials: M.D..
How much does Mark King, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark King, M.D. wrote 478 Medicare Part D claims totaling $124K in drug costs for 121 beneficiaries.
Where is Mark King, M.D. located? ▼
Mark King, M.D. is located at 4800 RIVERBEND RD, Boulder, CO, 80301. Phone: (303) 415-8850.
What is Mark King, M.D.'s NPI number? ▼
Mark King, M.D.'s National Provider Identifier (NPI) is 1902888746, issued on 11/17/2005.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,292 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Mark King, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark King, M.D.'s most frequently prescribed drugs include Amoxicillin-Clavulanate Potass, Amoxicillin, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark King, M.D. accept Medicare? ▼
Mark King, M.D. appears in CMS Medicare data with 478 Part D claims and 121 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark King, M.D.'s credentials? ▼
Mark King, M.D.'s NPI is 1902888746 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
Compiled from official public sources by the PlainDoctor editorial team.