Claims · Updated 2026-09-08 · 4 min read

What is the difference between CO-119, CO-35 and CO-149?

119 covers the annual maximum and frequency limits both. 35 is the lifetime maximum. 149 is a per-service lifetime cap. Three codes three fixes on a dental EOB.

Three codes say "maximum" and they mean three different things. 119 is the ambiguous one: it reads "the benefit maximum for this time period or occurrence has been reached", and that "or occurrence" makes it dual-use — the same code covers the dollar maximum is spent and the patient has already had this procedure as often as the plan allows. 35 is the lifetime maximum: a once-per-lifetime pot, classically orthodontics, is gone. 149 is narrower still — the lifetime cap on one particular service or benefit category, not on the plan. The fixes diverge completely. A spent annual maximum resets on a date. A frequency limit reopens on a per-procedure interval. A lifetime maximum never comes back. As of September 2026, across 37 dental practices, annual maximum was 7.8% of denied lines, frequency 14.4%, and lifetime maximum 0.2%.

What we measured

Denied lines are lines paid at $0 with a stored reason: what we saw across 37 dental practices and 170+ payers, all dates, measured September 2026. Separately, the bare token 119 was printed on 771 remittance lines by 31 different payers, at 12 practices.

Frequency outnumbers annual maximum by nearly two to one, and both can arrive under 119. That ratio is the reason the code is worth arguing about: a line reading 119 is more likely to be a history question than an accumulator question, and offices default to the accumulator.

What the carriers' own documents say

Delta Dental's crosswalk maps 76 of its 938 internal policy codes to CARC 119 — and files both meanings under it. The annual maximum, policy code 7G1, PR to participating and non-participating dentists alike:

"The patient's annual maximum has been reached."

And the frequency intervals, all under the same CARC 119 — policy code 779, whose sibling codes 727, 729, 781 and 782 state two, five and seven years:

"The enrollee's program has a limitation of once in a three-year period for this service."

Delta also files 90-day and 30-day intervals, three-times-in-six-months and four-times-in-twelve-months caps under 119. The lifetime codes are separate. Policy code 745 maps to CARC 35:

"The patient's lifetime benefit for this treatment has been reached."

And policy code 844 maps to CARC 149, which is the per-service cap in one sentence:

"The repair of a fixed retainer is allowed once per lifetime to a dentist/dental office that did not place the original fixed retainer."

All from Delta Dental — Policy ID Mapping for CARC/RARC Health Care Policy Codes, pinned at Delta Dental of California network scope. One trap from that same table: Delta's own policy code 119 means a procedure code not in the approved CDT set. X12's CARC 119 is the benefit maximum. The same three digits appear on Delta remittances meaning both.

Why it depends on the contract

Every number behind these codes is bought by the employer group. The annual maximum is a dollar figure the group chose; the frequency intervals are windows the group's plan document sets; the orthodontic lifetime maximum is a separate pot with its own figure. The carrier applies them, it does not set them, which is why two patients on the same carrier hit 119 at different points in the same year.

The group letters are steadier here than elsewhere. Delta prints its maximum and frequency codes as PR for participating and non-participating dentists alike on the codes above; not universally — policy code 448 is PR for a non-participating dentist and PI for a participating one. Where the code is PR, these are amounts the plan says the patient owes, and for an in-network dentist they are owed at the contracted allowance rather than the office's full fee.

What to do

• Read the remark code beside 119 before deciding what happened. A frequency remark — M86, N435, or the numeric ones like "allowed once in six months" — means pull the patient's history. A stated dollar figure means check the accumulator.
• On an annual maximum, give the patient the reset date, not just the refusal. That date is what decides whether the next appointment moves.
• On a frequency denial, give the date the interval reopens for that specific procedure. "Too soon" without a date is not an answer the patient can act on.
• On 35 or 149, stop. There is no appeal on a spent lifetime benefit; the work is telling the patient plainly and quoting the full fee.
• Do not treat 149 as the plan's lifetime maximum. It caps one service, and the rest of the plan's benefits are unaffected.
• Check the remaining maximum and the frequency history at the benefit check, before treatment. Frequency, age and annual maximum together were 31% of all denied lines — nearly a third of dental denials were knowable from the patient's own benefit history before the appointment.

Numbers last refreshed September 2026.

All articles · Kaylie