- Pulmonary Disease certification here refers to AOBIM's Subspecialty Certification in Pulmonary Disease, not any other board's credential sharing the name.
- The exam is 300 multiple-choice questions over 7 hours, scored on the AOA 200-800 scale with 500 as passing.
- Candidates need AOA/AOBIM internal medicine certification plus two years of accredited pulmonary (or combined pulmonary/critical-care) fellowship training.
- The posted initial-exam fee is $800, with a $240 late fee - figures that should be reconfirmed on the live portal before you pay.
What "Pulmonary Disease" Certification Actually Means
When this site refers to "Pulmonary Disease," it means one specific thing: the Subspecialty Certification in Pulmonary Disease administered through the American Osteopathic Board of Internal Medicine (AOBIM). No independently verified official postnominal abbreviation exists for this credential - "Pulmonary Disease" is the working label used across this site, not a trademarked designation issued by the board. That distinction matters because several credentials in medicine share similar naming conventions, and importing facts, fees, or pass-rate data from any of them onto this certification would be misleading.
If you're still orienting yourself to what this credential covers and how it differs from general internal medicine certification, start with What Is Pulmonary Disease? and Pulmonary Disease Certification for broader context before diving into the mechanics below.
Who Governs the Credential
The American Osteopathic Board of Internal Medicine (AOBIM) governs the examination content and administration, while the American Osteopathic Association (AOA) formally awards the certification itself. AOBIM's current candidate documents point applicants toward AOA's remote-exam preparation materials, which name MonitorEDU for proctoring and secure-browser services and Paradigm as the testing platform. That said, the retrieved pulmonary initial-exam page does not explicitly confirm a vendor or delivery mode for every 2026 sitting - candidates should always verify their specific authorization letter rather than assume delivery details carry over automatically.
This two-tier structure (AOBIM for content, AOA for the credential) is a defining feature of how this certification works, and it's worth understanding before you dig into deeper procedural questions covered in Pulmonary Disease Requirements 2026.
Anatomy of the Exam
The initial certification exam is a written, computer-based test built from 300 multiple-choice questions administered across 7 hours. AOBIM's published description does not itemize active testing time separately from tutorials or breaks, so candidates should plan their pacing around the full 7-hour block rather than assuming a shorter "working" window. The content itself spans basic science and clinical knowledge and interpretation - meaning questions are not purely recall-based; many require applying physiologic or pharmacologic reasoning to a clinical vignette.
No adaptive-testing behavior has been verified for this exam, so you should prepare assuming a fixed-form test where every question counts equally toward your total, rather than a format that adjusts difficulty based on your running performance.
Key Takeaway
Treat the 7-hour exam like a marathon of sustained concentration across 300 items - pacing strategy matters as much as content mastery. For a full difficulty breakdown, see How Hard Is the Pulmonary Disease Exam?
Passing Score Mechanics
Results are reported on the AOA 200-800 scaled-score system, with 500 or higher required to pass. This is a scaled score, not a raw percentage - so it is inaccurate to describe passing as "62.5% correct." Overall pass/fail status is based on total correctly answered items across the exam, not an average of individual content-area scores. For a deeper walkthrough of what the scaled score actually represents, see Pulmonary Disease Passing Score 2026.
The 21 Content Domains
AOBIM's blueprint for this exam is organized into 21 official content areas, each assigned a percentage range rather than a fixed weight. That's an important nuance: AOBIM publishes ranges, so you should not assume a domain's midpoint is its exact weight, nor should you expect the ranges to sum neatly to 100% or translate into a precise question count per domain.
The two heaviest-weighted domains - Interstitial lung disease and Pneumonia/pulmonary infections - are tied at 10-14% each, making them the single most important content areas to master. Interpretation PFTs follows at 7-11%, and Tuberculosis sits at 6-10%. Together, these four domains likely represent well over a third of the exam.
Interstitial Lung Disease (10-14%)
Candidates must distinguish among the major ILD subtypes, recognize characteristic imaging and biopsy patterns, and understand staging and management approaches.
- Pattern recognition on high-resolution CT findings
- Differentiating idiopathic pulmonary fibrosis from other interstitial processes
Pneumonia/Pulmonary Infections (10-14%)
This domain spans community-acquired, hospital-acquired, and opportunistic infections, along with antimicrobial selection logic.
- Severity scoring and site-of-care decisions
- Atypical and immunocompromised-host presentations
Interpretation PFTs (7-11%)
Pulmonary function test interpretation is tested directly, not just referenced - expect flow-volume loops, spirometry patterns, and diffusion capacity values presented as data to interpret.
- Obstructive vs. restrictive pattern recognition
- DLCO interpretation in mixed-disease scenarios
The remaining 17 domains range from narrowly scoped areas like Bronchiectasis/cystic fibrosis (1-3%) and Sarcoidosis (1-3%) up to broader categories such as Chronic bronchitis and emphysema (4-8%) and ARDS/respiratory failure (4-8%). A complete breakdown of all 21 domains, with study strategies for each, is available in Pulmonary Disease Exam Domains 2026: Complete Guide to All 21 Content Areas.
| Domain Tier | Example Domains | Approximate Weight |
|---|---|---|
| Highest weight | Interstitial lung disease, Pneumonia/pulmonary infections | 10-14% each |
| High weight | Interpretation PFTs, Tuberculosis | 6-11% |
| Moderate weight | Chronic bronchitis/emphysema, ARDS/respiratory failure | 4-8% |
| Lower weight | Bronchiectasis/CF, Sarcoidosis, Lung abscess | 1-5% |
Fees and Registration Mechanics
As currently posted, the initial-exam fee is $800, with a $240 late fee for candidates who miss standard application deadlines. There are no published member versus non-member fee tiers on the pulmonary-specific page. One important caveat: the same page still displays a March-July 2025 application window at the time of review, meaning these fees should be treated as currently posted figures rather than a guaranteed 2026 checkout price. Always recheck the live certification portal before budgeting around a specific number - a full cost breakdown with context is available in Pulmonary Disease Certification Cost 2026: Complete Pricing Breakdown, and exact timing considerations are covered in Pulmonary Disease Exam Dates 2026.
Who Is Eligible
Eligibility for this exam is layered. Candidates must already hold AOA/AOBIM primary certification in internal medicine and must have completed two years of an ACGME-accredited or AOA-recognized pulmonary fellowship - the written-exam page also references combined pulmonary/critical-care training pathways, with training completion required by August 15 of the examination year. Beyond training, candidates need an active medical license, a completed application and fees, adherence to AOA ethics standards, and a program-director report confirming clinical competence and program completion.
General AOBIM policy recognizes COCA-accredited DO or LCME-accredited MD education paired with qualifying training, and the broader board-eligibility window runs six years, ending December 31 of the sixth year following fellowship. No independent patient-contact-hour or minimum-reference-count requirement was identified for this specific exam. International medical graduates should note that general AOA rules on international training are broader than what's summarized on the abbreviated board-policy page, so individual eligibility should be confirmed directly rather than assumed. The full eligibility walkthrough lives in Pulmonary Disease Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Maintaining the Credential
Once earned, this certification is valid for 10 years, contingent on participation in Osteopathic Continuous Certification (OCC) and maintenance of an active medical license. For the 2025-2027 CME cycle, time-limited diplomates need 60 CME credits total, including 15 Category 1 and/or Category 1-A credits, plus one quality-improvement activity attestation per three-year cycle.
AOBIM's Component 3 page lists Pulmonary Disease among the subspecialties with annual remotely proctored OCC exams, and candidates may begin that renewal exam process up to two years before their certification expires. It's worth flagging explicitly: longitudinal-assessment changes announced for general internal medicine or cardiology certifications should not be assumed to automatically apply to pulmonary - always verify against the pulmonary-specific OCC page.
Mapping Study Time to the Blueprint
Because the blueprint weights are published as ranges rather than fixed percentages, the smartest allocation of study time follows the hierarchy of those ranges rather than treating all 21 domains equally. Interstitial lung disease and Pneumonia/pulmonary infections, at 10-14% each, deserve the earliest and most repeated review blocks. Interpretation PFTs (7-11%) deserves dedicated practice with actual flow-volume loops and spirometry printouts, not just textbook description, since this domain tests interpretation skill rather than memorization. Tuberculosis (6-10%) rounds out the top tier. A simple spaced-repetition approach - reviewing high-weight domains multiple times across your study calendar rather than once and moving on - works well here specifically because those four domains alone can represent more than a third of your total questions.
Highest-Weight Domains
- Interstitial lung disease pattern recognition
- Pneumonia/pulmonary infections management algorithms
Interpretation-Heavy Domains
- PFT interpretation drills with real flow-volume loops
- Tuberculosis diagnosis and treatment regimens
Mid-Weight Domains
- ARDS/respiratory failure and ICU ventilatory care
- Chronic bronchitis and emphysema staging
Lower-Weight Breadth and Full Practice
- Rapid review of remaining 13 domains
- Full-length timed practice sessions on the practice test platform
For a step-by-step version of this approach built around the full blueprint, see Pulmonary Disease Study Guide 2026: How to Pass on Your First Attempt. And if you're weighing whether the time and cost investment makes sense for your career stage, Is the Pulmonary Disease Certification Worth It? Complete ROI Analysis 2026 and Pulmonary Disease Salary Guide 2026 are useful companion reads before you commit to a registration date.
Practicing against realistic question formats matters more than passive review for a 300-question, 7-hour exam. Running timed blocks on our practice test platform before test day helps build the stamina this exam actually demands, and reviewing missed items by domain lets you redirect study time toward whichever high-weight area is weakest.
Frequently Asked Questions
No independently verified official postnominal abbreviation exists for this specific credential. "Pulmonary Disease" is used on this site as a working label for AOBIM's Subspecialty Certification in Pulmonary Disease, not as an invented or trademarked designation.
The initial certification exam contains 300 multiple-choice questions delivered over 7 hours. This question count applies to initial certification only, not to the OCC recertification exam.
You need a scaled score of 500 or higher on the AOA 200-800 scale. This is not equivalent to a raw percentage correct, and your result is based on total correct answers across the exam rather than an average across content domains.
Candidates need existing AOA/AOBIM internal medicine certification and two years of ACGME-accredited or AOA-recognized pulmonary (or combined pulmonary/critical-care) fellowship training, plus an active license, completed application and fees, and a program-director report confirming competence.
The credential is valid for 10 years provided you maintain Osteopathic Continuous Certification requirements, including CME credits and periodic remotely proctored OCC exams, which you may begin up to two years before expiration.