OB Denial Appeal Letter Templates

How to use these

Each template is a complete letter. Replace every [BRACKETED] field, delete any paragraph that does not apply, and attach exactly the documents listed under the template, in the order listed. Keep the letter to one page; reviewers uphold what they cannot quickly verify. Send through the payer’s designated appeal channel with the denial remittance attached, and calendar the payer’s appeal deadline the day the denial posts.

One thing these letters are not: a substitute for checking that the denial is actually wrong. The CO-97 guide and CO-50 guide each have a “when the denial is correct” section. Read those first; appealing correct denials burns credibility you will want later.

Template 1: CO-97 global package bundling

Use when a service that is genuinely outside the global OB package (an obstetric ultrasound, an NST, a problem E/M visit with its own diagnosis) denied as included in the global allowance. Do not use for routine prenatal visits billed alongside a global code; those are correctly bundled.

[DATE]

[PAYER NAME]
Attn: Appeals Department
[PAYER APPEALS ADDRESS]

Re:    First-Level Appeal, Denial Code CO-97
Patient:          [PATIENT NAME]
Member ID:        [MEMBER ID]
Claim Number:     [CLAIM NUMBER]
Date of Service:  [DOS]
Service:          [CPT CODE], [PLAIN-LANGUAGE SERVICE NAME]
Billed Amount:    [AMOUNT]

To the Appeals Reviewer:

We are appealing the denial of [CPT CODE] on the claim above, denied
as included in the payment for another service (CO-97). The service
was bundled into the global obstetric package. It does not belong
there, and we ask that the denial be reversed.

The global obstetric package covers routine antepartum visits,
delivery, and routine postpartum care. Diagnostic services are
outside the package and separately payable. [CPT CODE] is a
diagnostic service, performed on [DOS] for the following indication:
[INDICATION, e.g. "suspected fetal growth restriction, ICD-10
O36.59XX"]. It is not a routine antepartum visit and was not part of
the routine visit schedule.

[IF PROBLEM E/M VISIT, REPLACE PRIOR PARAGRAPH WITH: The visit on
[DOS] addressed [COMPLICATION, e.g. "gestational hypertension,
ICD-10 O13.3"], a problem distinct from routine prenatal care. The
attached note documents evaluation and management beyond the routine
schedule, with the complicating diagnosis reported as primary.
Problem-focused care for pregnancy complications is separately
payable outside the global package.]

Enclosed:
  1. Remittance advice showing the CO-97 denial
  2. Order for the denied service with documented indication
  3. [INTERPRETATION REPORT / VISIT NOTE] for the denied service
  4. [OPTIONAL: PAYER MEDICAL POLICY NUMBER] excerpt listing
     services excluded from the global package

We ask that [CPT CODE] be reprocessed and paid. Please contact
[BILLER NAME] at [PHONE] with any questions.

Sincerely,

[BILLER NAME], [TITLE]
[PRACTICE NAME]
[PRACTICE NPI / TAX ID]

Attach: the remittance, the order with indication, and the interpretation or note. For problem visits, the note must show the complication managed, not restated.

Template 2: CO-50 medical necessity, detailed ultrasound

Use when an indicated detailed fetal anatomy ultrasound (76811) denied for medical necessity and the qualifying indication exists in the record. If the original claim simply lacked the qualifying diagnosis code, submit a corrected claim instead; it is faster than this letter.

[DATE]

[PAYER NAME]
Attn: Appeals Department
[PAYER APPEALS ADDRESS]

Re:    First-Level Appeal, Denial Code CO-50
Patient:          [PATIENT NAME]
Member ID:        [MEMBER ID]
Claim Number:     [CLAIM NUMBER]
Date of Service:  [DOS]
Service:          76811, detailed fetal anatomy ultrasound
Billed Amount:    [AMOUNT]

To the Appeals Reviewer:

We are appealing the medical-necessity denial of CPT 76811 on the
claim above. The study met [PAYER NAME]'s coverage criteria for a
detailed fetal anatomy examination, and the qualifying indication
was documented at the time of the order.

The indication for this examination was [INDICATION, e.g.
"pregestational type 2 diabetes mellitus, ICD-10 O24.113"],
established in the record on [DATE INDICATION DOCUMENTED]. This
indication appears in [PAYER POLICY NUMBER OR NAME, e.g. "your
medical policy [NUMBER], Detailed Fetal Anatomy Ultrasound"] as a
covered indication for this study. [IF NO PAYER POLICY AVAILABLE:
This indication is recognized in the joint specialty-society
guidance on detailed fetal anatomic examinations published by
SMFM, ACOG, and AIUM.]

Supporting documentation, enclosed:
  1. Remittance advice showing the CO-50 denial
  2. Ultrasound order dated [ORDER DATE] stating the indication
  3. Clinical note dated [NOTE DATE] establishing [INDICATION]
  4. Complete interpretation report for the examination
  [5. OPTIONAL: corrected claim reflecting ICD-10 [CODE] as the
      primary diagnosis, if the original claim omitted it]

The examination was indicated, ordered for that indication,
performed, and documented. We ask that CPT 76811 be reprocessed
and paid. Please contact [BILLER NAME] at [PHONE] with questions.

Sincerely,

[BILLER NAME], [TITLE]
[PRACTICE NAME]
[PRACTICE NPI / TAX ID]

Attach: the order, the note establishing the indication, and the full interpretation report. The note proving the indication predates or accompanies the order is the load-bearing document.

Template 3: TC/26 component split correction

Use when an imaging or NST claim denied or paid wrong because of a professional/technical component problem: the global service billed when only one component was performed, a missing modifier, or both entities billing overlapping components. This is a correction letter as much as an appeal; it tells the payer exactly which component belongs to whom.

[DATE]

[PAYER NAME]
Attn: Appeals / Claim Corrections
[PAYER APPEALS ADDRESS]

Re:    Component Billing Correction and Appeal
Patient:          [PATIENT NAME]
Member ID:        [MEMBER ID]
Claim Number:     [CLAIM NUMBER]
Date of Service:  [DOS]
Service:          [CPT CODE] with modifier [26 / TC]
Billed Amount:    [AMOUNT]

To the Appeals Reviewer:

We are writing regarding the denial of [CPT CODE] on the claim
above, denied with [DENIAL CODE AND REMARK CODE, e.g. "CO-16 /
N822"]. The denial reflects a professional/technical component
issue, corrected as follows.

On [DOS], [PRACTICE NAME] performed only the [PROFESSIONAL /
TECHNICAL] component of this service: [ONE SENTENCE, e.g. "our
physician interpreted the study and issued the report; the imaging
was performed on equipment owned by [FACILITY NAME]"]. The service
should be reported as [CPT CODE]-[26 / TC].

[CHOOSE ONE:]
[A. The original claim omitted the modifier. A corrected claim
reporting [CPT CODE]-[26 / TC] is enclosed. We ask that it replace
the original line and be processed for the [PROFESSIONAL /
TECHNICAL] component allowance.]
[B. The original claim correctly reported [CPT CODE]-[26 / TC],
and the denial appears to reflect a duplicate-component conflict
with a claim from [OTHER ENTITY NAME], which performed the
[TECHNICAL / PROFESSIONAL] component only. The two claims cover
different components of one service and are separately payable to
each entity. Neither claim reported the global service.]

Enclosed:
  1. Remittance advice for the denied claim
  2. [CORRECTED CLAIM, if option A]
  3. Interpretation report identifying the interpreting physician
     [and/or facility record identifying the equipment owner]

We ask that the [PROFESSIONAL / TECHNICAL] component be processed
and paid to [PRACTICE NAME]. Please contact [BILLER NAME] at
[PHONE] with questions.

Sincerely,

[BILLER NAME], [TITLE]
[PRACTICE NAME]
[PRACTICE NPI / TAX ID]

Attach: the corrected claim when the modifier was missing, and the interpretation report either way. When two entities are involved, coordinate before sending so both sides’ claims tell the same story; mismatched component claims deny in pairs.

FAQ

Can I send these as written? Yes, once every bracket is filled and inapplicable paragraphs are deleted. Payers process structure well; the format is deliberately conventional.

Should the physician sign the appeal? For first-level appeals a biller’s signature is normally sufficient. Escalated appeals and peer-to-peer reviews benefit from physician involvement, and some payers require it at second level; check the denial letter’s appeal instructions.

What deadline applies? Whatever the payer’s appeal window says, commonly 90 to 180 days from the remittance date, and shorter under some Medicaid managed-care contracts. The window is in the provider manual and often on the denial itself. Calendar it the day the denial posts.