MBS item 11503 ===== Complex respiratory function testing in a respiratory laboratory under specialist supervision, including lung volumes, diffusion capacity, airway resistance, bronchoprovocation, exercise testing, muscle strength, altitude simulation, shunt calculatio… Category 2 · Diagnostic procedures and investigations[Group D1 · subgroup 4](/groups/D1) Schedule fee$165.95 100% benefitGP, out of hospital— 85% benefitOut of hospital$141.10 75% benefitIn hospital$124.50 The schedule fee for MBS item 11503 is $165.95. Medicare pays $141.10 (85%) out of hospital, or $124.50 (75%) for a privately admitted patient in hospital. Fee effective 1 July 2026. Gap for what you charge ----------------------- Your fee$ Out of hospitalIn hospital (private) Medicare pays$141.10 Patient gap$24.85 Bulk billing means accepting $141.10 as full payment, with no gap and no extra charges. [Add incentives](/bulk-billing?item=11503) Item descriptor --------------- Complex measurement of properties of the respiratory system, including the lungs and respiratory muscles, that is performed: (a) in a respiratory laboratory; and (b) under the supervision of a specialist or consultant physician who is responsible for staff training, supervision, quality assurance and the issuing of written reports on tests performed; and (c) using any of the following tests: (i) measurement of absolute lung volumes by any method; (ii) measurement of carbon monoxide diffusing capacity by any method; (iii) measurement of airway or pulmonary resistance by any method; (iv) inhalation provocation testing, including pre‑provocation spirometry and the construction of a dose response curve, using a recognised direct or indirect bronchoprovocation agent and post‑bronchodilator spirometry; (v) provocation testing involving sequential measurement of lung function at baseline and after exposure to specific sensitising agents, including drugs, or occupational asthma triggers; (vi) spirometry performed before and after simple exercise testing undertaken as a provocation test for the investigation of asthma, in premises equipped with resuscitation equipment and personnel trained in Advanced Life Support; (vii) measurement of the strength of inspiratory and expiratory muscles at multiple lung volumes; (viii) simulated altitude test involving exposure to hypoxic gas mixtures and oxygen saturation at rest and/or during exercise with or without an observation of the effect of supplemental oxygen; (ix) calculation of pulmonary or cardiac shunt by measurement of arterial oxygen partial pressure and haemoglobin concentration following the breathing of an inspired oxygen concentration of 100% for 15 minutes or greater; (x) if the measurement is for the purpose of determining eligibility for pulmonary arterial hypertension medications subsidised under the Pharmaceutical Benefits Scheme or eligibility for the provision of portable oxygen—functional exercise test by any method (including 6 minute walk test and shuttle walk test); each occasion at which one or more tests are performed Not applicable to a service performed in association with a spirometry or sleep study service to which item 11505, 11506, 11507, 11508, 11512, 12203, 12204, 12205, 12207, 12208, 12210, 12213, 12215, 12217 or 12250 applies Not applicable to a service to which item 11507, 12218 or 12219 applies [Explanatory notes and rules on MBS Online ↗](https://www9.health.gov.au/mbs/fullDisplay.cfm?type=item&q=11503) Health fund and DVA rates ------------------------- Total fee each scheme recognises for this item in hospital. StateNSWVICQLDSAWATASACTNT Guides ------ - [How Medicare benefits work: schedule fees, 75%, 85% and 100%](/guides/how-medicare-benefits-work) - [Medicare safety nets explained: original and extended (EMSN) thresholds for 2026](/guides/medicare-safety-nets) - [In-hospital billing: the 75% benefit, the 25% fund benefit, and no-gap and known-gap schemes](/guides/in-hospital-billing-and-gap-cover) - [Bulk billing incentives and BBPIP explained: 2026 amounts by MM area](/guides/bulk-billing-incentives) - [The MBS multiple operation rule and surgical assistant fees](/guides/multiple-operation-rule) - [Assignment of benefit for bulk billing: the changes from 1 July 2026](/guides/assignment-of-benefit-2026) - [MBS telehealth rules: the eligible telehealth practitioner and phone items](/guides/mbs-telehealth-rules) - [GP chronic condition management plans: items 965 and 967 explained](/guides/chronic-condition-management-plans) - [Medicare billing compliance: claim time limits, records and the 80/20 rule](/guides/medicare-billing-compliance) Data source: [Australian Government Medicare Benefits Schedule](https://www.mbsonline.gov.au/) · Record updated 1 September 2026. Health fund rates come from each fund's published schedule. Verify item descriptors, rules and fees on [MBS Online](https://www9.health.gov.au/mbs/fullDisplay.cfm?type=item&q=11503) before billing. This is a reference tool, not billing or financial advice.