Te Whatu Ora says it's put a fair offer on the table as it stares down the barrel of an unprecedented strike by senior doctors and dentists.

Association of Salaried Medical Specialists members will walk off the job for two hours tomorrow from midday.

About 250 planned care procedures are likely to be deferred, although emergency care is still available.

Te Whatu Ora's Andrew Slater says they're offering salary increases of up to 12.9 percent over the next 12 months.

"Anything more than what we've got on the table would require further reprioritisation."

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