- What "Pulmonary Disease" Means as a Certification
- Who Earns This Credential - and Who Hires For It
- Exam Format, Questions, and Timing
- The 21 Content Domains You're Tested On
- Eligibility and Prerequisites
- Registration, Fees, and Dates
- How the Passing Score Actually Works
- Maintaining Certification Through OCC
- Building a Pulmonary-Specific Study Plan
- Frequently Asked Questions
- Certification in Pulmonary Disease is awarded by AOBIM through the AOA, not a generic internal-medicine subspecialty label.
- The initial exam is 300 multiple-choice questions administered over 7 hours.
- Passing requires a scaled score of 500+ on the 200-800 AOA scale, not a percentage of correct answers.
- Interstitial lung disease and pneumonia/pulmonary infections are the two heaviest domains, each weighted 10-14%.
What "Pulmonary Disease" Means as a Certification
When this site refers to Pulmonary Disease, it means one specific credential: the Subspecialty Certification in Pulmonary Disease governed by the American Osteopathic Board of Internal Medicine (AOBIM), with the certificate itself awarded through the American Osteopathic Association (AOA). It is not a generic descriptor for any lung-related credential, and it should not be confused with similarly-named programs from other certifying organizations. If you landed here searching "what is pulmonary disease" in a medical-dictionary sense, you may want our companion piece, What Is Pulmonary Disease?, which addresses the clinical term rather than the osteopathic subspecialty certification.
This article focuses narrowly on the certification pathway: who it's for, what the exam covers, how it's structured, and what it costs to pursue and maintain. For a deeper dive into terminology distinctions, see Pulmonary Disease Meaning and What Does Pulmonary Disease Stand For?.
Who Earns This Credential - and Who Hires For It
This certification is pursued by osteopathic physicians who have already completed AOA/AOBIM board certification in internal medicine and then gone on to complete pulmonary fellowship training. It signals to hospitals, pulmonary practice groups, ICU staffing teams, and sleep medicine centers that a physician has met AOBIM's defined standard of clinical competence in pulmonary disease management - not just completed training, but demonstrated knowledge across a structured content blueprint.
Because the credential sits downstream of internal medicine certification, it tends to matter most for physicians applying to pulmonology-specific roles, critical care/pulmonary combined positions, academic pulmonary divisions within osteopathic-affiliated health systems, and hospital credentialing committees that specifically recognize AOA board certification. If you're mapping out career paths after certification, our guides on Pulmonary Disease Jobs and Pulmonary Disease Salary Guide 2026: Complete Earnings Analysis go into more depth on where this credential tends to open doors.
Exam Format, Questions, and Timing
The initial certification exam is a written, computer-based test made up of 300 multiple-choice questions, and candidates are given 7 hours total to complete it, per AOBIM. The published description does not separately break out active testing time versus tutorial or break time, so plan your pacing around the full 7-hour window rather than assuming a specific number of "testing minutes."
Content is described as covering basic science and clinical knowledge and interpretation - meaning you should expect both foundational physiology/pathology questions and applied clinical-reasoning items built around patient scenarios, imaging, and pulmonary function data. No adaptive-testing format has been verified for this exam, so you can expect a fixed-form, linear question set rather than a test that adjusts difficulty based on your answers.
For a full breakdown of what makes this exam challenging relative to its format and content load, see How Hard Is the Pulmonary Disease Exam? Complete Difficulty Guide 2026.
The 21 Content Domains You're Tested On
AOBIM organizes the pulmonary exam blueprint into 21 official content areas, each assigned a percentage range rather than a fixed weight. That distinction matters: AOBIM does not guarantee an exact number of questions per domain, and you shouldn't study as if the ranges collapse to a single midpoint number. Below is the full list with the published ranges.
| Domain | Weight Range |
|---|---|
| Respiratory structure and function | 2-6% |
| Asthma | 3-7% |
| Chronic bronchitis and emphysema | 4-8% |
| Sleep disorders | 3-7% |
| Bronchiectasis/cystic fibrosis | 1-3% |
| Interstitial lung disease | 10-14% |
| Pneumonia/pulmonary infections | 10-14% |
| Tuberculosis | 6-10% |
| Benign/malignant neoplasms | 2-6% |
| Occupational disorders | 1-5% |
| Sarcoidosis | 1-3% |
| Lung abscess | 1-5% |
| Physical, chemical, and aspiration injuries | 2-6% |
| Disorders of diaphragm, chest wall, pleura, and mediastinum | 1-4% |
| Disorders of ventilatory control | 2-6% |
| Pulmonary hypertension/vascular disorders | 1-5% |
| PE/DVT | 1-5% |
| Interpretation imaging studies/pathologic specimens | 1-5% |
| Interpretation PFTs | 7-11% |
| ARDS/respiratory failure | 4-8% |
| ICU management/ventilatory care | 1-5% |
Interstitial Lung Disease (10-14%)
Tied for the single heaviest domain on the blueprint. Candidates should be comfortable distinguishing idiopathic pulmonary fibrosis from other ILD subtypes, correlating HRCT patterns with clinical presentation, and knowing which serologic and biopsy findings point toward connective-tissue-associated disease.
- Expect imaging-pattern recognition questions paired with clinical vignettes.
Pneumonia/Pulmonary Infections (10-14%)
Equally weighted with ILD as the largest domain. This spans community-acquired and hospital-acquired pneumonia, fungal and atypical pathogens, and complications like abscess or empyema that overlap with other domains on the list.
- Review pathogen-specific treatment algorithms, not just diagnostic criteria.
Interpretation of PFTs (7-11%)
Pulmonary function test interpretation is tested heavily and independently from the disease-specific domains - meaning you need fluency in reading flow-volume loops, spirometry, and lung-volume data cold, separate from recognizing the underlying disease.
- Practice pattern recognition: obstructive vs. restrictive vs. mixed defects, and DLCO interpretation.
Because these ranges and their clinical sub-points are dense, we built a dedicated breakdown covering every domain in detail: Pulmonary Disease Exam Domains 2026: Complete Guide to All 21 Content Areas.
Eligibility and Prerequisites
You cannot sit for this exam without first holding AOA/AOBIM primary certification in internal medicine. Beyond that foundation, AOBIM requires:
- Two years of training in an ACGME-accredited or AOA-recognized pulmonary fellowship (the written-exam page also references combined pulmonary/critical-care training pathways)
- Completion of training by August 15 of the examination year
- An active, unrestricted medical license
- A completed application and payment of required fees
- Adherence to AOA ethical standards
- A program-director report confirming clinical competence and completion of training
Under general AOBIM policy, candidates must have graduated from a COCA-accredited DO program or an LCME-accredited MD program, and board-eligibility generally runs on a six-year window ending December 31 of the sixth following year after fellowship completion. International medical graduates should confirm eligibility directly with AOA/AOBIM, since general AOA international-graduate policy is broader than what's summarized on the abbreviated board-policy page. For a complete prerequisite checklist, see Pulmonary Disease Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Registration, Fees, and Dates
As currently posted on AOBIM's pulmonary certification page, the initial-exam fee is $800, with a $240 late fee if you miss the standard registration deadline. There are no published member/non-member fee tiers for this exam specifically. Importantly, the same page that lists these fees also still displays a March-July 2025 application window at the time these facts were compiled - so treat the dollar figures as currently posted rather than a guaranteed 2026 checkout price, and recheck the live AOBIM portal before you pay.
AOBIM's exam timing is generically described as occurring in August, but an exact 2026 calendar date could not be confirmed from the dynamically rendered scheduling page. Don't assume a specific date until you see it in your candidate authorization. We track this in more detail in Pulmonary Disease Exam Dates 2026: Testing Windows, Deadlines & Scheduling, and if you want the full fee breakdown with context, see Pulmonary Disease Certification Cost 2026: Complete Pricing Breakdown.
Key Takeaway
Don't rely on cached fee pages or old application windows - confirm the current examination fee, late-fee deadline, and exact test date through your AOBIM candidate portal before registering.
How the Passing Score Actually Works
Passing requires a scaled score of 500 or higher on the AOA's 200-800 scale. This is a critical point candidates misunderstand: a scaled score of 500 is not the same as answering 62.5% of questions correctly. The AOA scaling system converts your raw number of correctly answered items (out of 300) into a scaled score, and overall results are based on total correct answers rather than averaging separate scores across the 21 content domains. In other words, you don't need to "pass" each domain individually - strength in one area can offset weakness in another, as long as your total correct-answer count clears the scaled threshold.
Be cautious about pass-rate numbers you might find elsewhere online. Statistics tied to other certifying boards, vendor marketing claims, or old forum posts are not valid data for this specific AOBIM pulmonary cohort. We cover what's actually knowable about pass rates in Pulmonary Disease Pass Rate 2026: What the Data Shows, and a full explanation of the scoring mechanics lives in Pulmonary Disease Passing Score 2026: Exactly What You Need to Pass.
Maintaining Certification Through OCC
Certification in Pulmonary Disease is valid for 10 years, contingent on participation in Osteopathic Continuous Certification (OCC). To stay in good standing, diplomates must maintain active licensure and, for the 2025-2027 CME cycle, complete 60 CME credits, including at least 15 Category 1 and/or Category 1-A credits, plus one quality-improvement activity attestation per three-year CME cycle.
AOBIM's Component 3 page lists Pulmonary Disease among the subspecialties with annual remotely proctored OCC exams, and candidates are permitted to begin the recertification process up to two years before their certificate expires. One important caution: changes to longitudinal-assessment formats announced for general internal medicine or cardiology do not automatically apply to pulmonary recertification - verify current OCC exam structure specifically for pulmonary before assuming format parity with other subspecialties.
Building a Pulmonary-Specific Study Plan
Given the 7-hour, 300-question format and the uneven domain weighting, an effective study plan allocates more review time to the heaviest domains - interstitial lung disease, pneumonia/pulmonary infections, tuberculosis, and PFT interpretation - without neglecting the narrower 1-3% domains that still contribute real points.
Foundation and Heavy Domains
- Build baseline review of respiratory structure/function, then move into interstitial lung disease and pneumonia/pulmonary infections given their 10-14% weight each
PFT Fluency and Mid-Weight Domains
- Dedicate focused sessions to PFT interpretation (7-11%), tuberculosis (6-10%), and chronic bronchitis/emphysema (4-8%)
Narrow Domains and Full Timed Practice
- Cover the 1-5% domains (occupational disorders, PE/DVT, ICU management, sarcoidosis, lung abscess) and run full-length timed practice to simulate the 7-hour format
A spaced-repetition approach works well here specifically because the domain weights are uneven - reviewing high-yield ILD and infection content more frequently than low-weight domains like sarcoidosis mirrors how the actual exam is likely to sample content. For a complete week-by-week framework built around these exact domains, see Pulmonary Disease Study Guide 2026: How to Pass on Your First Attempt. You can also pressure-test your recall with timed practice questions on our practice test platform before exam day.
If you're still deciding whether to pursue this credential at all, weigh the time and cost commitment against your career goals in Is the Pulmonary Disease Certification Worth It? Complete ROI Analysis 2026. And if you want a condensed, exam-day-friendly reference of the highest-yield facts across all 21 domains, bookmark Pulmonary Disease Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Frequently Asked Questions
No. It's a subspecialty certification that requires AOBIM internal medicine certification first, followed by completion of pulmonary (or combined pulmonary/critical-care) fellowship training before you're eligible to sit for the pulmonary exam.
The initial exam contains 300 multiple-choice questions administered over a 7-hour testing window, according to AOBIM. This count applies to initial certification, not the OCC recertification exam.
You need a scaled score of 500 or higher on the AOA's 200-800 scale. This is based on your total number of correct answers across the full exam, not an average of scores across the 21 domains, and it is not equivalent to a 62.5% raw-correct threshold.
As currently posted, the initial-exam fee is $800, with a $240 late fee for missed deadlines. These are the posted figures on AOBIM's pulmonary page; confirm current pricing on the live portal since the same page still references a 2025 application window.
Interstitial lung disease and pneumonia/pulmonary infections are jointly the heaviest domains at 10-14% each, followed by interpretation of PFTs (7-11%) and tuberculosis (6-10%). These four domains deserve disproportionate study time relative to the narrower 1-3% domains.