Commonwealth Higher Education Student Support Number (CHESSN)

Commonwealth Higher Education Student Support Number (CHESSN): a 10-digit number identifying a student's HELP loans and Commonwealth support. Being retired in favour of the USI since 2021 but still present on Commonwealth Assistance Notices and legacy records.

Type: regex
Engine: boost_regex
Confidence: medium
Confidence justification: Medium: primary anchors are distinctive form titles and statutory terms, but they also appear in guidance, blank forms and statistics, so enforce tiers require populated record structure. 85/75 are heuristic evidence tiers, not measured accuracy; test values are synthetic records laid out like the published forms.
Jurisdictions: au
Regulations: Higher Education Support Act 2003 (Cth), Privacy Act 1988 (Cth)
Frameworks: QGISCF
Data categories: education, government-id, pii
Scope: narrow
Risk rating: 5
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Degraded, Netskope: Unsupported

Pattern

(?i)\b(?:CHESSN|Commonwealth\s+Higher\s+Education\s+Student\s+Support\s+Number)\s*(?:no\.?|number)?\s*[:#]?\s*\d{10}\b

Corroborative evidence keywords

HELP, HECS-HELP, FEE-HELP, USI, myHELPbalance, Commonwealth Assistance Notice, census date, Commonwealth supported place

Proximity: 300 characters

Should match

Commonwealth Assistance Notice Student name: Avery Teston Student number: 45118273 CHESSN: 4471820331 HECS-HELP debt incurred this census date: $4,524. — Populated record 1
Student name: Morgan Teston CHESSN 3051182749 USI: 7HGT3K9WQ2 FEE-HELP balance transferred to myHELPbalance. — Populated record 2
Commonwealth Higher Education Student Support Number: 2208841563 Student ID: s4471820 Commonwealth supported place confirmed for Semester 2. — Populated record 3

Should not match

Your CHESSN is a unique 10-digit number. Since 2021 the USI has replaced the CHESSN for most purposes. — Guidance or explainer text
CHESSN: __________ Student name: __________ — Blank form
Student support numbers are listed in the TCSI element E488 for legacy reporting. — Aggregate statistics or news

Known false positives

Guidance pages, fact sheets, policy and training text that name the record type. Mitigation: Enforce tiers require populated record fields; guidance uses the labels without values.
Blank forms and form kits. Mitigation: Blank lines, square-bracket and angle-bracket placeholders and n/a/tbc values are rejected.
Aggregate statistics and news reporting. Mitigation: No populated person or reference fields, so these stay at 65 discovery.

References

Study Assist — Your USI and CHESSN (anchor confirmed from official-domain search results; page fetch blocked)