- What This Certification Actually Is
- Exam Format, Questions, and Time
- The 21 Content Domains at a Glance
- Fees, Registration, and Dating Caveats
- Passing Score Snapshot
- Eligibility and Prerequisites Snapshot
- OCC and Renewal Snapshot
- One-Glance Study Sequencing
- Who Looks for This Credential
- Frequently Asked Questions
- AOBIM (American Osteopathic Board of Internal Medicine) governs this exam; AOA awards the credential.
- Initial exam: 300 multiple-choice questions, 7 hours total, scored on a 200-800 scale with 500 as passing.
- Interstitial lung disease and Pneumonia/pulmonary infections are jointly the largest domains at 10-14% each.
- Posted initial-exam fee is $800 with a $240 late fee - confirm current pricing before paying.
What This Certification Actually Is
Before memorizing a single fact, get the identity straight. This credential is formally the Subspecialty Certification in Pulmonary Disease, administered by the American Osteopathic Board of Internal Medicine (AOBIM), with the actual certificate issued through the American Osteopathic Association (AOA). There is no separately invented postnominal abbreviation for this credential beyond the plain program name - "Pulmonary Disease" on this site is a descriptive label, not a trademarked set of letters.
This matters because several unrelated credentials share similar wording, and mixing up fee schedules, pass rates, or vendor names from a different board will give you wrong expectations. If you want the full plain-language explanation of what the credential covers and who it's for, see What Is Pulmonary Disease Certification? For a deeper dive into eligibility mechanics before you sit for anything, read Pulmonary Disease Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format, Questions, and Time
The initial certification exam is a written, computer-based multiple-choice test built around two broad content lenses: basic science and clinical knowledge and interpretation. There is no verified adaptive-testing component - treat it as a fixed-length linear exam unless your official notice says otherwise.
- Question count: 300 multiple-choice items for the initial certification exam (do not confuse this with any separate OCC recertification item count).
- Total time: 7 hours, as described by AOBIM. The page does not break this down into separate tutorial, break, and active testing segments, so plan your pacing around the full block.
- Delivery: Remote proctoring guidance from AOA requires a Windows/Mac computer with administrator access, a mobile camera device for room scanning, a private testing space, identity verification, and a secure browser.
- On-screen resources: Lab values, a calculator, and a scratchpad are provided on-platform. Personal external references are not authorized.
If you're trying to gauge how tough this actually feels in practice relative to your training background, How Hard Is the Pulmonary Disease Exam? Complete Difficulty Guide 2026 goes into that question directly.
The 21 Content Domains at a Glance
AOBIM structures the blueprint around 21 official content areas, each given a percentage range, not a fixed weight. That distinction matters for your study plan: a range tells you relative emphasis, but AOBIM does not guarantee an exact number of questions per topic, and the ranges are not designed to sum neatly to 100%.
| Domain | 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, 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%) & Pneumonia/Pulmonary Infections (10-14%)
These two domains are jointly the largest share of the exam, which makes them the single highest-leverage area for review time. Expect questions spanning classification, radiographic pattern recognition, and management decisions across both chronic fibrotic disease and acute/subacute infectious presentations.
- Pattern recognition on imaging tied to specific ILD subtypes
- Distinguishing typical vs. atypical pneumonia presentations and empiric management
- Complications and follow-up decision points for both domains
Interpretation of PFTs (7-11%)
Pulmonary function test interpretation is a near-guaranteed heavy domain. You should be fluent in reading flow-volume loops, obstructive vs. restrictive patterns, and how DLCO and lung volumes shift the differential - this skill also bleeds into questions nominally filed under other domains like chronic bronchitis/emphysema or ILD.
Tuberculosis (6-10%)
Tuberculosis sits well above several other single-digit domains, so treat it as a core content area rather than a minor topic. Expect diagnostic algorithms, latent vs. active disease management, and drug-resistance considerations.
For a domain-by-domain breakdown with study approaches for each of the 21 areas, see Pulmonary Disease Exam Domains 2026: Complete Guide to All 21 Content Areas.
Fees, Registration, and Dating Caveats
The currently posted fee structure for the initial pulmonary exam is straightforward but comes with an important caveat: the same page displaying these numbers also still shows a March-July 2025 application window, which means these are posted fees, not independently reconfirmed 2026 checkout prices.
- Initial exam fee: $800
- Late fee: $240
- No separate member vs. non-member fee tiers are published on the pulmonary-specific page.
Passing Score Snapshot
Passing is set at 500 or higher on AOA's 200-800 scaled-score system. This is not a simple "percent correct" threshold - the scale converts your raw performance, and your overall result is based on total correctly answered items across the exam rather than averaging separate content-area scores. Don't treat any single domain as a pass/fail gate on its own; overall accuracy is what counts.
A common mistake is assuming this works like a 62.5% raw-score cutoff because 500 sits partway between 200 and 800 - it doesn't. For the full explanation of how scaled scoring works and what it means for your target accuracy, see Pulmonary Disease Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Study to maximize total correct answers across all 21 domains rather than trying to "clear a bar" in each domain individually - the scoring model rewards overall accuracy.
Eligibility and Prerequisites Snapshot
Before you can even register, you need:
- Primary AOA/AOBIM certification in internal medicine
- Two years of an ACGME-accredited or AOA-recognized pulmonary fellowship (the written-exam page also references combined pulmonary/critical-care training pathways)
- Training completion by August 15 of the examination year
- Active medical license, a completed application, paid fees, and adherence to AOA ethics requirements
- A program-director report establishing clinical competence and training completion
More broadly, general AOBIM policy recognizes COCA-accredited DO or LCME-accredited MD education plus qualifying training, and sets a six-year board-eligibility window that ends December 31 of the sixth following year after fellowship completion. If you trained internationally, note that general AOA international-graduate rules are broader than this abbreviated summary - confirm your individual eligibility directly rather than assuming. Full prerequisite detail lives in Pulmonary Disease Requirements 2026: Eligibility, Prerequisites & How to Qualify.
OCC and Renewal Snapshot
Certification is valid for 10 years, conditional on staying current with Osteopathic Continuous Certification (OCC) and maintaining active licensure. For the 2025-2027 CME cycle, time-limited diplomates need 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 materials list pulmonary disease among the subspecialties with an annual, remotely proctored OCC exam, and candidates may begin that process up to two years before their certification expires. Keep in mind that longitudinal-assessment changes announced for general internal medicine or cardiology certifications do not automatically carry over to pulmonary - verify pulmonary-specific OCC rules separately each cycle.
One-Glance Study Sequencing
Rather than a generic week-by-week template, sequence your review around domain weight. Put the heaviest-weighted, highest-stakes material first while your energy and time budget are largest, then work down to the lower-weight domains.
Highest-Weight Domains
- Interstitial lung disease (10-14%)
- Pneumonia/pulmonary infections (10-14%)
- Interpretation of PFTs (7-11%)
Mid-Weight Domains
- Tuberculosis (6-10%)
- Chronic bronchitis and emphysema (4-8%)
- ARDS/respiratory failure (4-8%)
- Asthma and sleep disorders (3-7% each)
Lower-Weight, High-Breadth Domains
- Neoplasms, occupational disorders, injuries, ventilatory control disorders (1-6% range)
- Pulmonary hypertension/vascular disorders, PE/DVT, lung abscess, ICU management (1-5% each)
- Sarcoidosis, bronchiectasis/cystic fibrosis, chest wall/pleura/mediastinum disorders (1-4% each)
Full Mixed Review
- Timed practice blocks mimicking the 7-hour, 300-question structure
- Rotate weak domains back in using spaced repetition on missed-question logs
This sequencing logic, including how to handle the overlap between PFT interpretation and the disease-specific domains it supports, is covered in more depth in Pulmonary Disease Study Guide 2026: How to Pass on Your First Attempt. For hands-on practice that mirrors the real question style, use the timed sets on the main practice test platform.
Who Looks for This Credential
Osteopathic physicians who complete pulmonary fellowship training pursue this certification to formally validate subspecialty competence recognized by AOA-affiliated hospital credentialing committees, group practices, and health systems that staff pulmonary and critical-care services. It signals completion of fellowship training plus successful performance on a standardized, board-governed exam - a credential hospital privileging committees and recruiters can verify directly with AOBIM/AOA.
If you're weighing whether the time and fee investment pays off for your career stage, Is the Pulmonary Disease Certification Worth It? Complete ROI Analysis 2026 lays out the qualitative tradeoffs, and Pulmonary Disease Salary Guide 2026: Complete Earnings Analysis and Pulmonary Disease Jobs cover the employment landscape in more detail.
Frequently Asked Questions
300 multiple-choice questions, administered over a total of 7 hours as described by AOBIM.
500 or higher on AOA's 200-800 scaled-score system, based on total correct answers rather than an averaged percentage. See Pulmonary Disease Passing Score 2026 for details.
The posted initial-exam fee is $800, with a $240 late fee. No member/non-member tiers are published, and you should reconfirm pricing on the live portal since the source page still shows 2025 application dates.
Interstitial lung disease and Pneumonia/pulmonary infections are jointly largest at 10-14% each, followed by Interpretation of PFTs at 7-11% and Tuberculosis at 6-10%.
10 years, contingent on completing Osteopathic Continuous Certification (OCC) requirements, including CME credits and periodic remotely proctored OCC exams.
Keep this page bookmarked as your fast-reference check, but pair it with full-length content review and timed practice on the practice test site before exam day - a one-page summary is a review tool, not a substitute for working through all 21 domains in depth.