- AOBIM administers this Subspecialty Certification in Pulmonary Disease, not a separate independent board.
- The initial exam has 300 multiple-choice questions over 7 hours, with a posted $800 fee plus a $240 late fee.
- Passing requires a scaled score of 500+ on the AOA 200-800 scale, not a flat percentage correct.
- Interstitial lung disease and Pneumonia/pulmonary infections each carry the heaviest weight at 10-14%.
What the Certification Actually Is
Certification in Pulmonary Disease, as recognized on this site, refers specifically to the Subspecialty Certification in Pulmonary Disease governed by the American Osteopathic Board of Internal Medicine (AOBIM), with the credential ultimately awarded through the American Osteopathic Association (AOA). This is an important distinction: several credentials in medicine share overlapping acronyms, but the program described here is an AOBIM subspecialty pathway built on top of AOA internal medicine certification.
AOBIM administers the examination itself. Candidates researching remote testing logistics will find that AOA's remote-exam preparation materials reference MonitorEDU for proctoring and secure-browser services, with Paradigm named as the testing platform for AOA exams generally. However, the pulmonary-specific initial-exam page does not independently confirm a vendor or delivery mode for every sitting, so candidates should always verify their personal exam authorization letter rather than assume details carried over from a different exam setup.
If you're still orienting yourself to what this credential involves day-to-day, the companion piece on What Is Pulmonary Disease Certification? walks through the basics in plainer terms, and Pulmonary Disease Certification offers a broader landscape view.
Eligibility and Prerequisites
Before a candidate can even register, several prerequisites must be satisfied:
- Primary certification: AOA/AOBIM certification in internal medicine is required as the foundation.
- Fellowship training: Two years of an ACGME-accredited or AOA-recognized pulmonary fellowship. The written-exam page also references combined pulmonary/critical-care training pathways.
- Completion deadline: Training must be completed by August 15 of the examination year.
- Licensure and ethics: An active medical license and adherence to AOA ethical standards.
- Program-director attestation: A program-director report establishing clinical competence and completion of training.
- Application and fees: A completed application and payment of the required fees.
Under general AOBIM policy, candidates from COCA-accredited DO programs or LCME-accredited MD programs with qualifying training fall within a six-year board-eligibility window that ends December 31 of the sixth following year after eligibility begins. 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 needs direct confirmation rather than assumption.
For a full breakdown of each requirement and how they interact, see Pulmonary Disease Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format, Fees, and Timing
The initial certification exam is a written, computer-based multiple-choice test. It is built around basic science and clinical knowledge, with an emphasis on interpretation - reading films, pulmonary function data, and clinical scenarios rather than pure recall.
| Exam Element | Detail |
|---|---|
| Question count (initial exam) | 300 multiple-choice questions |
| Total time | 7 hours (as described by AOBIM; active testing time, tutorials, and breaks not separately itemized) |
| Format | Written, computer-based; no adaptive-testing claim verified |
| Passing score | 500 or higher on the AOA 200-800 scaled-score system |
| Initial exam fee | $800 (posted fee) |
| Late fee | $240 |
Note the dating caveat: the pulmonary exam page currently still displays a March-July 2025 application window at time of review, and these are posted fees rather than independently reconfirmed 2026 checkout prices. Always recheck the live certification portal before treating a fee figure as guaranteed. For a deeper cost breakdown including how late fees and application timing interact, read Pulmonary Disease Certification Cost 2026: Complete Pricing Breakdown. For scheduling specifics, Pulmonary Disease Exam Dates 2026: Testing Windows, Deadlines & Scheduling covers what's publicly known about the testing calendar.
The 21 Content Domains
AOBIM organizes the exam blueprint into 21 official content areas, each given a percentage range rather than a fixed weight. This matters for study planning: AOBIM does not promise exact question counts per domain, and the ranges do not need to sum neatly to 100%, so treat them as relative emphasis rather than a precise formula.
Interstitial Lung Disease (10-14%)
Tied for the single highest-weighted domain. Expect scenario-based questions on diagnosis and classification of fibrotic and inflammatory lung processes.
- Pattern recognition on imaging and clinical presentation
Pneumonia/Pulmonary Infections (10-14%)
Equally weighted with interstitial lung disease as the top domain. Covers community-acquired and hospital-associated infections, causative organisms, and treatment selection.
- Differentiating infectious etiologies and appropriate workup
Interpretation of PFTs (7-11%)
A heavily tested interpretation-based domain. Candidates must read pulmonary function test patterns and connect them to underlying disease processes.
- Obstructive vs. restrictive pattern recognition
Tuberculosis (6-10%)
A substantial standalone domain covering diagnosis, staging, and management considerations distinct from general pneumonia content.
- Treatment regimens and latent vs. active disease distinctions
The remaining 17 domains span a wide range of emphasis, from Asthma (3-7%) and Chronic bronchitis and emphysema (4-8%) to narrower domains like Bronchiectasis/cystic fibrosis (1-3%) and Sarcoidosis (1-3%). Mid-weight domains include Sleep disorders (3-7%), ARDS/respiratory failure (4-8%), and Disorders of ventilatory control (2-6%). Lower-weighted but still testable domains include Occupational disorders (1-5%), Lung abscess (1-5%), Pulmonary hypertension/vascular disorders (1-5%), PE/DVT (1-5%), Interpretation of imaging studies/pathologic specimens (1-5%), and ICU management/ventilatory care (1-5%). Rounding out the list are Respiratory structure and function (2-6%), Benign/malignant neoplasms (2-6%), Physical, chemical, and aspiration injuries (2-6%), Disorders of diaphragm, chest wall, pleura, and mediastinum (1-4%), and ARDS/respiratory failure as noted above.
For the complete breakdown of all 21 domains with study implications for each, see Pulmonary Disease Exam Domains 2026: Complete Guide to All 21 Content Areas.
Scoring and Passing Standard
The passing standard is 500 or higher on the AOA's 200-800 scaled-score system. This is not the same as needing 62.5% of raw questions correct - the scale is a statistical conversion, and overall results are based on total correctly answered items across the exam rather than averaging performance across individual content areas. In other words, a weak showing in one lower-weighted domain does not automatically fail a candidate who performs well across the exam as a whole.
Be cautious of pass-rate figures circulating online. Search-visible statistics tied to other credentials, vendor-reported "customer success rates," or old forum anecdotes do not represent a verified AOBIM cohort pass rate for this specific pulmonary certification. If you want a realistic read on difficulty and scoring mechanics, Pulmonary Disease Passing Score 2026: Exactly What You Need to Pass and Pulmonary Disease Pass Rate 2026: What the Data Shows dig into what's actually confirmable versus what's noise.
Key Takeaway
Don't chase a percentage-correct target. Focus on broad competency across all 21 domains, since the scaled score rewards overall correct-answer volume, not domain-by-domain averages.
Preparing by Domain Weight
Because AOBIM publishes ranges rather than fixed weights, a sensible preparation strategy allocates more review time to the domains with the widest and highest ranges, while still touching every domain at least once. A practical way to sequence study blocks:
Highest-Yield Domains
- Interstitial lung disease and Pneumonia/pulmonary infections - both at 10-14%
- Interpretation PFTs at 7-11%
Secondary High-Weight Domains
- Tuberculosis (6-10%)
- Chronic bronchitis and emphysema (4-8%)
- ARDS/respiratory failure (4-8%)
Mid-Range Domains
- Asthma, Sleep disorders, Disorders of ventilatory control
- Respiratory structure/function, Benign/malignant neoplasms, Injuries
Narrow-Weight Domains and Full Review
- Bronchiectasis/CF, Sarcoidosis, Occupational disorders, Lung abscess, PE/DVT, Pulmonary hypertension, Imaging interpretation, Diaphragm/chest wall/pleura/mediastinum, ICU management
- Full-length timed practice under 7-hour conditions
Spacing review sessions and interleaving topics (rather than studying one domain in isolation for days) tends to help retention given how many interpretation-heavy domains - PFTs, imaging, pathology - appear on this exam. For a structured week-by-week plan built specifically around this blueprint, see the Pulmonary Disease Study Guide 2026: How to Pass on Your First Attempt. If you're trying to gauge how much total effort this exam demands compared to other steps in your training, How Hard Is the Pulmonary Disease Exam? Complete Difficulty Guide 2026 addresses that directly. You can also reinforce domain recall using timed practice sets on the main practice test site before attempting a full simulated exam.
Renewal and OCC
Certification is valid for 10 years, contingent on maintaining Osteopathic Continuous Certification (OCC). Diplomates must keep their medical license active throughout. For the 2025-2027 CME cycle specifically, 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 CME cycle.
Pulmonary Disease is listed among the annual remotely proctored subspecialty OCC exams under the current Component 3 structure, and candidates may begin the recertification process up to two years before their certification expires. It's worth noting explicitly: changes to longitudinal-assessment formats that have been reported for general internal medicine or cardiology certifications should not be assumed to apply automatically to pulmonary recertification - the component structures are tracked separately.
Who Hires Pulmonary Disease Diplomates
This subspecialty certification sits on top of internal medicine board certification and pulmonary fellowship training, so holders are typically pulmonologists practicing in hospital-based pulmonary and critical-care groups, academic medical centers with fellowship programs, multispecialty physician groups, and private pulmonary practices. Because the domain list includes heavy ICU management and ARDS/respiratory failure content, many diplomates also work across combined pulmonary/critical-care roles rather than purely outpatient pulmonary clinics.
If you're evaluating career direction or compensation expectations tied to holding this credential, Pulmonary Disease Salary Guide 2026: Complete Earnings Analysis and Pulmonary Disease Jobs cover the practical employment landscape. For a broader cost-versus-benefit framing before committing to the application fees and fellowship time investment, Is the Pulmonary Disease Certification Worth It? Complete ROI Analysis 2026 lays out the considerations without manufactured statistics.
Candidates who are still clarifying basic terminology - including how this credential's name is used and sometimes confused with other meanings - may find What Is Pulmonary Disease?, Pulmonary Disease Meaning, What Does Pulmonary Disease Stand For?, What Is A Pulmonary Disease?, and What Does Pulmonary Disease Mean? useful for disambiguation. For training-pathway context before you even reach the exam stage, Pulmonary Disease Training is a relevant companion read, and you can start building exam familiarity anytime on the practice test platform.
Frequently Asked Questions
The American Osteopathic Board of Internal Medicine (AOBIM) administers the exam, with the certification ultimately awarded through the American Osteopathic Association (AOA).
The initial certification exam has 300 multiple-choice questions administered over 7 hours, as described by AOBIM. This count applies to the initial exam only, not OCC recertification testing.
You need a scaled score of 500 or higher on the AOA's 200-800 scale. This is a scaled result based on total correct answers, not a simple 62.5% correct threshold.
The currently posted initial-exam fee is $800, with a $240 late fee if applicable. No separate member/non-member fee tiers are published on the pulmonary exam page. Always confirm current pricing on the live portal before relying on a posted figure.
Certification is valid for 10 years, conditional on maintaining Osteopathic Continuous Certification (OCC), active licensure, and meeting CME requirements for each cycle, including the current 2025-2027 cycle's 60 CME credit requirement.