1. Document information

Title:

Mental Health National Outcomes and Casemix Collection: Technical specification of State and Territory reporting requirements.

Version:

4.00

1.1. Changes to the data model

The data model changes to the 2025-26 specifications, compared to 2024-25 are listed in Table 1.1.

Table 1.1 Changes made to 2025-26 data model compared to 2024-25 model

Data item	Details	Rationale
Specialised mental health service organisation—organisation identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 4 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Establishment—service unit cluster identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 5 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Hospital - hospital identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 5 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Specialised mental health service - admitted patient service unit identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 6 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Specialised mental health service - ambulatory service unit identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 6 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Specialised mental health service - residential service unit identifier, X(9)	Updated to include a new value domain. Maximum character length increased from 6 characters to 9 characters.	To support the use of extended entity identifiers generated by local jurisdictional data systems.
Person—person identifier, XXXXXX[X(58)]	Updated to include a new value domain. Maximum character length increased from 20 characters to 64 characters.	To support the use of extended person identifiers generated by local jurisdictional data systems.
Record identifier	This item is included in the technical specifications, but is not a formal data element included in METEOR. Maximum character length increased from 10 characters to 128 characters.	To support the use of extended record identifiers generated by local jurisdictional data systems.

1.2. Changes to definitions

The definitional changes to the 2025-26 specifications, compared to 2024-25 are listed in Table 1.2.

Table 1.2 Changes made to 2025-26 definitions compared to 2024-25

Data items	Details	Rationale
Establishment - Australian state/territory identifier, code N	Updated to include a new value domain.	Value domain updated to include Norfolk Island in Code 9 Other Territories. Does not impact mental health collections.
Episode of care—principal diagnosis, code (ICD-10-AM Thirteenth Edition) ANN{.N[N]}	Updated to include a new value domain.	Value domain updated to the 13th edition.
Episode of care—additional diagnosis, code (ICD-10-AM Thirteenth Edition) ANN{.N[N]}	Updated to include a new value domain.	Value domain updated to the 13th edition.

1.3. Document history

Version	Date	Details
4.00	X/X/2025	Final version 4.00 (to have effect from 1 July 2025) Updated METEOR references for Mental health legal status and added Gender to be consistent with other MH NMDS.
3.00	09/04/2023	Final version 3.00 (to have effect from 1 July 2024) Updated METEOR references for Mental health legal status and added Gender to be consistent with other MH NMDS.
2.11	15/04/2023	Final version 2.11 (to have effect from 1 July 2023) Updated METEOR code sets for the data elements included in the NOCC NMDS and NBEDS.
2.10	19/04/2022	Final version 2.10 (to have effect from 1 July 2022) Updated METeOR references and code sets for Statistical Area Level 2 (SA2) code (ASGS Edition 3), ICD-10-AM (12th edition), Phase of Care and Sex to be consistent with the MH NMDS.
2.03	06/11/2020	Final version 2.03 (to have effect from 1 July 2021) Updated METeOR references for Mental Health Legal Status, State/ Territory Identifier to be consistent with the MH NMDS.
2.02	22/03/2019	Final version 2.02 (to have effect 1 July 2019).
2.02 (Draft)	22/3/2019	Draft version endorsed by the MHISSC incorporating ICD-10-AM 11th Edition domain values for principal and additional diagnoses and updating METeOR data element references.
2.01	29/05/2018	Final version 2.01 (to have effect as of 1 July 2017).
2.01 (Draft)	23/3/2018	Draft version endorsed by the MHISSC incorporating ICD-10-AM 10th Edition domain values for principal and additional diagnoses.
2.00	17/07/2017	Final version 2.0 (to have effect as of 1 July 2017).
2.00 (Draft)	24/3/2017	Draft version for consideration by the MHISSC incorporating removal of Focus of Care and addition of Phase of Care.
1.90	21/04/2016	Final version 1.90 (to have effect on a best efforts basis as of 1 July 2015).
1.90 (Draft)	18/3/2016	New data elements (County of Birth; Indigenous Status & Area of Usual Residence) for the Collection Occasions Details Record endorsed by the MHISSC.
1.80	15/02/2016	Pagination issue in main document corrected.
1.80	29/05/2015	Final version 1.80 (to have effect on a best efforts basis as of 1 July 2015).
1.80 (Draft)	20/2/2015	Draft version for consideration by the MHISSC incorporating changes to the collection of (i) consumer-self report for Adults & Older Persons in inpatient settings and; (ii) clinician and consumer rated measures at discharge from ambulatory episodes.
1.70	11/11/2013	Final version 1.70 (to have effect as of 1 July 2013).
1.70 (Draft)	17/10/2013	Draft for in principle endorsement by MHISS.
1.70 (Draft)	30/9/2013	Changes to requirement for HoNOS/CA/65+ discharge ratings from inpatient service settings.
1.62	6/6/2013	ASGC replaced with ASGS endorsed by the MHISS.
1.61	7/6/2012	Changes to domain values for Target Population endorsed by the MHISS.
1.60 (Final)	13/02/2009	Version endorsed by MHISS (to have effect as of 1 July 2009).
1.60 (Draft 4)	13/2/2009	Final specifications submitted to MHISS for endorsement.
1.60 (Draft 3)	18/8/2008	Draft for in principle endorsement by MHISS.
1.60 (Draft 2)	8/8/2008	Amended draft for review by Technical Specifications Drafting Group.
1.60 (Draft 1)	24/7/2008	Initial draft for review by Technical Specifications Drafting Group.
1.50	01/12/2003	Final version 1.5 (to have effect as of 1 July 2003).
1.50 (Draft 3)	27/10/2003	Draft revised following comment on Draft 2 and provided for ‘sign off’ by the National Mental Health Working Group.
1.50 (Draft 2)	15/9/2003	Distributed to States and Territories for internal consultation and comment.
1.50 (Draft 1)	24/7/2003	Initial draft distributed to Drafting Group.
1.00	30/08/2002	Final version 1.0 (to have effect as of 1 July 2000).
1.00 (Final pre-publication)	1/6/2002	Final pre-publication version produced for National Mental Health Outcomes Trainers’ Forum.
1.00 (Draft 3)	18/2/2002	Draft revised following comment on Draft 2 and provided for ‘sign off’ by States and Territories.
1.00 (Draft 2)	10/10/2001	Distributed to States and Territories for internal consultation and comment.
1.00 (Draft 1)	16/9/2001	Initial draft distributed to Drafting Group; amended following comment by site coordinators and substantial new content added to incomplete sections.