Migraines Secondary to Major Depressive Disorder Claim Guide

We analyzed the Board's published decisions and found migraines (DC 8100) claimed as secondary to major depressive disorder (DC 9434) is a real, mid-sized claim pool that wins clearly more often than it loses once it reaches a merits decision.

How those 405 issues came out

The ICD-10 diagnosis codes most commonly used for DC 8100, Migraines (the kind on your medical records, decision letter, or C&P exam report). VA rates the disability and its residuals, not the diagnosis itself, so coding can vary.

See the full diagnostic-code page →

Under 38 CFR 3.310 a secondary claim turns on three elements:

• A current diagnosis: a medical diagnosis of migraines (the secondary).
• A service-connected primary: Major Depressive Disorder, already service-connected (the primary). A 0% primary still counts.
• A medical nexus: a medical opinion linking the migraines to the major depressive disorder, showing the primary caused or aggravated it.

See the Secondary Claim guide for the caused-versus-aggravated split, and the Nexus Letter guide for what makes the medical opinion strong.

Whether that medical link exists in any one case is a medical question decided on that case's own evidence (the nexus).

The outcome split above counts whole issues. This section goes one layer deeper. Under 38 CFR § 3.310 a secondary claim can be won two ways: the major depressive disorder caused the migraines (§ 3.310(a)), or it aggravated an existing migraines (§ 3.310(b)). Every grant rests on one or the other, so the numbers below divide up the granted claims only.

Direct causation is the route that carries most grants here: 89% of them found the major depressive disorder caused the migraines, the rest found aggravation. A practical consequence for the nexus opinion: it should address both routes, because a medical opinion that only argues causation leaves the aggravation theory, a separate legal basis, on the table. See the caused-vs-aggravated guide for how the two theories differ.

On the other side: in 24 denied claims the Board looked at this pairing and found no link, meaning it decided the major depressive disorder neither caused nor worsened the migraines. That is a separate group from the grants above, counted here so the picture is not one-sided.

We analyzed published Board decisions on this pairing to build this split. The grant split covers granted claims only; denied, remanded, and dismissed claims are not in it. Descriptive of the published record, not a prediction.

The record VA actually reviews centers on a small set of documents. We analyzed published Board decisions on these claims and ranked the records that appeared most often:

• A medical nexus opinion: the one record VA weighs most on a secondary claim, a doctor's statement linking your migraines to your service-connected major depressive disorder and naming the mechanism.
• Prostrating attacks documented
• Attack frequency documented by a provider
• Headaches reported since service
• Missed work or economic impact from headaches
• Headache log, journal, or diary

The diagnostic code involved: DC 8100 (Migraines). The rating levels for this code are in the rating section below.

Records ranked by how often published Board decisions cited them. The exam that captures most of this is covered in the C&P Exam section below. Source: Board of Veterans' Appeals decisions, RateMyVSO analysis.

What veterans who win this pairing actually put in the file, and why each piece moves the claim.

• Neurologist diagnosis naming migraine specifically: A neurologist needs to write down "migraine" (not just "headaches"), the type, how often attacks hit, and whether they cause prostration (bad enough you need to lie down in a dark, quiet room). VA leans on that prostration detail to set your rating, so a plain "headaches" note from a general doctor will not carry the claim.
• Your mental health records showing the depression came first (or with it): Pull your MDD treatment records and diagnosis dates. You need a timeline that lines up depression with the start or worsening of your migraines. If migraines showed up years before the depression, that is not fatal, but your nexus letter has to explain why the depression still made them worse.
• A headache diary, at least two months of it: Write down every attack: date, how long it lasted, how bad it was, and what was going on around it (a bad week, a bad night's sleep, a medication change). VA does not trust memory alone. A dated diary is proof you cannot argue with.
• Your sleep records or a sleep log: This is the heart of the medical case. Depression wrecks sleep, and poor sleep is one of the strongest known migraine triggers. A sleep study or even a simple log showing insomnia or broken sleep gives your nexus letter something solid to point to.
• Full list of every psychiatric medication you have tried, with dates: SSRIs and other antidepressants can themselves disturb sleep or trigger migraines as a side effect. List every drug, when you started and stopped it, and match those dates against your headache diary. This heads off the VA argument that "it was the pill, not the depression."
• A nexus letter using the exact right words: The letter must say your migraines are "at least as likely as not caused by or aggravated by" your service-connected depression. Words like "possible" or "consistent with" will get the claim denied on the spot. The doctor should also spell out the actual chain: depression disrupts sleep, poor sleep lowers your migraine threshold, migraines follow. Do not let the letter just say both conditions exist and leave it there, that is the single most common reason these claims get denied.
• Proof of how migraines hurt your work and daily life: Missed work days, FMLA paperwork, a statement from your employer, or your own record of canceled plans and lost income. VA rates migraines based on how often they knock you out and how much work you miss, so this evidence is what turns "I have migraines" into a rated disability.
• Statements from people who see it happen: Ask a spouse, family member, or coworker to write what they have witnessed, how often you get hit, how bad it looks, and how it changes your day. A few consistent outside statements back up your own account and make the file harder to wave away.

These decisions show the Board granting service connection for migraine headaches as secondary to service-connected major depressive disorder (or a combined psychiatric disability that includes major depressive disorder). In each case, a private medical opinion linking migraines to depression outweighed a VA opinion that found no connection, or the Board found the private opinion equally persuasive and applied the benefit of the doubt. Board decisions are not binding on future cases, but the pattern of reasoning is consistent across these five.

The VA assigns one of these percentages based on what your medical record documents. Plain-language summary of the rating criteria at 38 CFR; the controlling text is the regulation itself.

Every item below comes from a pattern in the decisions on this pairing, not from general claim advice.

For the mechanics of filing itself, see the Standard Claim Guide and the Fully Developed Claim Guide.

A secondary claim moves through the same pipeline as any other. Understanding who does what helps you know who to contact and what to expect.

1. You file the claim, naming Major Depressive Disorder as the service-connected primary and migraines as secondary. Directly with VA, through VA.gov, or with an accredited representative's help.
2. VA assigns a Veteran Service Representative (VSR) to develop the claim: gather your service treatment records, VA and private medical records, and order a C&P exam if needed.
3. The C&P exam is conducted, usually with the examiner asked to address the specific secondary theory (causation and aggravation both).
4. The file goes to a Rating Veteran Service Representative (RVSR), the "rater," who weighs the medical evidence and decides service connection and, if granted, the rating percentage.
5. VA issues the decision letter stating the outcome and the reasoning.
6. If denied or under-rated, you choose an appeal lane, Supplemental Claim, Higher-Level Review, or a Board appeal, covered below.

Who's who: VSO vs. VSR vs. Rater vs. C&P Examiner

For the full walkthrough, see Inside Your Claim and Claim Stages.

A Disability Benefits Questionnaire (DBQ) is the standardized form the examiner completes for your condition. See the DBQ Guide for how these forms work and whether a private DBQ from your own doctor can be submitted instead of relying solely on a VA exam. For what to expect and how to prepare, see the C&P Exam Prep Guide, and be specific about how your migraines symptoms relate to your major depressive disorder timeline, treatment, and any aggravation, that is the detail a nexus opinion relies on.

Your decision letter has a narrative "reasons and bases" section and a codesheet with the rating and effective date. See the Reading Your Decision Letter Guide or use the Letter Interpreter tool to decode your own letter. If denied, you have three main lanes:

• Supplemental Claim: refile with new and relevant evidence, such as a nexus opinion that addresses the mechanism and the specific VA rationale you're rebutting. See Supplemental Claim Guide.
• Higher-Level Review (HLR): a senior reviewer looks at the same evidence again, useful if the denial rested on a legal error. See HLR Guide.
• Board Appeal: your case goes to a Veterans Law Judge, with a direct review, evidence, or hearing docket. See Board Appeal Guide.

Not sure which lane fits? See the Appeals decision guide for a side-by-side comparison.

Keep documentation of ongoing treatment, follow-up evaluations, and any updated diagnostic testing for your migraines on file, this protects you if VA schedules a future reexamination. See Protect Your Rating for when a rating becomes protected and Future Reexaminations for what triggers one. If your migraines worsens, see the Rating Increase Guide.