module 6

Question 1

Define Apportionment in California workers’ compensation.

Answer 1

The legal process of determining what percentage of an injured worker’s permanent disability is due to the current industrial injury versus other factors such as prior injuries, pre-existing conditions, or non-industrial causes.

Question 2

Why is apportionment important for QMEs?

Answer 2

It impacts how permanent disability (PD) benefits are calculated; a QME must fairly allocate between work-related and non-work-related causes to ensure accurate compensation.

Question 3

Which Labor Code section governs apportionment?

Answer 3

Labor Code §4663 — requires physicians to determine the approximate percentage of permanent disability caused by work vs other factors.

Question 4

What does Labor Code §4664 establish?

Answer 4

Credit for previously awarded permanent disability; prevents double recovery for the same body part or condition.

Question 5

Mnemonic for core apportionment steps

Answer 5

“IDEA” — Identify non-industrial factors, Determine % caused by work, Explain rationale, Apply % to PD rating.

Question 6

What must a QME do when apportioning disability?

Answer 6

Provide a reasoned medical explanation with percentages, citing medical history, prior injuries, diagnostic findings, and mechanism of current injury.

Question 7

What is non-industrial apportionment?

Answer 7

Disability caused by factors unrelated to work — e.g., congenital issues, prior non-work injuries, natural aging/degeneration.

Question 8

Example of industrial apportionment

Answer 8

A new back injury where part of the PD is due to long-term heavy lifting at work; QME may assign 60% work-related, 40% other factors.

Question 9

Example of non-industrial apportionment

Answer 9

Pre-existing degenerative disc disease contributing 30% to current PD while work injury contributes 70%.

Question 10

What is “no apportionment” scenario?

Answer 10

When the work injury is the sole cause of the permanent disability and no other factors contributed.

Question 11

How to handle multiple industrial injuries?

Answer 11

Apportion each injury separately and allocate % of PD to each, explaining overlap if conditions are cumulative.

Question 12

Define pre-existing condition in apportionment context.

Answer 12

Any medical issue or prior injury that existed before the current industrial event and contributes to permanent disability.

Question 13

Mnemonic for apportionment analysis

Answer 13

“HIPP” — History, Imaging, Prior function, Percentages.

Question 14

What is the difference between apportionment and causation of injury?

Answer 14

Causation of injury = did work cause/aggravate the condition; apportionment = how much PD is work-related vs other causes.

Question 15

Can natural progression of disease be apportioned?

Answer 15

Yes — if a degenerative disease would have worsened regardless of work, QME can apportion PD to natural progression.

Question 16

How should QME handle prior surgeries?

Answer 16

Review medical records, determine functional loss from prior surgery, and assign % of current PD to that pre-existing impairment if relevant.

Question 17

Pitfall if QME fails to explain percentages?

Answer 17

WCAB may reject apportionment; claim could be deemed 100% industrial if report lacks medical reasoning.

Question 18

Mnemonic to remember apportionment report structure

Answer 18

“PRIME” — Prior history, Records review, Industrial vs non-industrial, Medical rationale, Explicit % allocation.

Question 19

Does age alone justify apportionment?

Answer 19

No — age-related degeneration must be medically documented and shown to cause PD, not assumed.

Question 20

What is “lighting up” a pre-existing condition?

Answer 20

Work injury aggravates a dormant or asymptomatic condition making it disabling; still apportionable if permanent disability partly due to underlying pathology.

Question 21

How do similar jobs contribute to apportionment?

Answer 21

Prior employment with similar physical demands can be a non-current employer factor if it caused pre-existing impairment.

Question 22

Mnemonic for apportionment mistakes to avoid

Answer 22

“SAME” — Speculation, Assumptions, Missing records, Empty rationale.

Question 23

What is the “Eggshell Worker” rule and apportionment?

Answer 23

Employer takes worker as found; can’t avoid liability for work aggravation but may apportion for underlying non-industrial disease.

Question 24

Can temporary aggravations be apportioned?

Answer 24

No — temporary flare-ups without permanent impairment are not apportionable.

Question 25

Why does clear apportionment help all parties?

Answer 25

Reduces disputes, ensures fair benefits, prevents overpayment, and withstands legal challenge.