Disability supporting letters: what a third party actually needs to read

A disability supporting letter is read by someone who is not a doctor, deciding something that is not a medical question. Once you hold that thought, most of what makes these letters succeed or fail becomes obvious. The reader does not need to be told what your condition is called. They need to be told what it stops you doing, and how reliably.

Who these letters are for

A disability supporting letter is a comprehensive account of functional impact, written for a third party rather than for another clinician. The people who read them include local authority assessors, blue badge panels, university disability services, employers considering reasonable adjustments, insurers, landlords and housing officers, and occasionally courts.

None of them are qualified to interpret a diagnosis. All of them are working to a set of criteria, and every one of those criteria is about what a person can and cannot do. A letter that arrives naming a condition and nothing else forces the reader to make a medical inference they are not permitted to make, and the safest thing they can do with it is set it aside.

This is separate from a letter supporting a Personal Independence Payment claim, which is written around the DWP activities and descriptors. If that is what you need, our post on GP letters for PIP claims covers it. Housing applications have their own conventions and are covered separately.

What function actually means on paper

The useful unit of a disability supporting letter is not the symptom. It is the task.

Take washing and dressing. A letter that says a person has arthritis has said almost nothing. A letter that says a person cannot raise their arms above shoulder height without pain, cannot fasten buttons on most days, needs help getting into a bath, takes roughly 3 times as long as they would otherwise, and manages this on good days but not on bad ones, has given the reader something they can measure against their criteria.

Four qualifiers do most of the work, and a letter that omits them is usually the letter that gets rejected. Can the person do it safely. Can they do it to an acceptable standard. Can they repeat it as often as they reasonably need to. Does it take them a reasonable time. Doing something once, slowly, unsafely and in pain is not the same as being able to do it, and a good letter says so explicitly rather than leaving the reader to work it out.

Variability needs the same treatment. Conditions that fluctuate are the hardest to evidence, because a single assessment catches a single day. The letter should describe the typical position rather than the day of the appointment, and should say how often the bad days occur.

Where each statement comes from

The feature that most distinguishes a strong letter from a weak one has nothing to do with how sympathetic it sounds. It is whether the doctor makes clear where each statement comes from.

There are 4 distinct categories, and they should never be blurred. What is documented in the medical records. What the person has reported. What the doctor directly observed or assessed. What is the doctor’s professional opinion.

A letter that runs them together reads as advocacy, and an experienced assessor discounts advocacy on sight. A letter that separates them reads as honest, and the honest one is more persuasive precisely because the reader can see the doctor drawing a line between what they know and what they have been told. Saying that a person reports being unable to leave the house alone, and that this is consistent with the anxiety symptoms observed at assessment, is stronger than asserting that they cannot leave the house alone.

What the letter should not do

It should not state that the person qualifies for the thing they are applying for. Eligibility belongs to the assessor, and a doctor who claims it has stepped outside their competence in a way the reader will notice.

It should not overstate. If the evidence supports moderate impairment, the letter says moderate impairment. Inflating it does not raise the chance of success; it lowers the credibility of everything else in the document.

It should not go beyond what the assessment covered. If a person’s mobility was not examined, the letter does not opine on their mobility.

And it should not be written to order. Paying for an assessment buys the assessment and the doctor’s time. It does not buy a predetermined conclusion, and any doctor who suggests otherwise is selling something that will not survive contact with an assessor.

Getting the most out of the assessment

The quality of a supporting letter is limited by the quality of the material the doctor has. Two things reliably improve it.

The first is records. Hospital letters, clinic correspondence, medication lists, physiotherapy or psychology notes, previous assessments. A letter that can point to a documented history stretching back years is a different document from one resting on a single consultation.

The second is a functional diary. If you spend 2 weeks before the appointment noting what you struggled with, how long tasks took, what you needed help with and how many bad days you had, you will give the doctor specifics rather than generalities. Most people underestimate their own difficulties when asked directly in a consulting room, because coping becomes invisible to the person doing it.

Frequently asked questions

What is the difference between a disability supporting letter and a medical report?

Length, formality and purpose. A supporting letter is a focused account of function written for an assessor. A report is a longer expert document, with a statement of truth and a declaration of the doctor’s duty, prepared where the evidence will be tested in a tribunal or court. If a hearing is involved, you need the report.

Can my own GP write it?

Often yes, and their evidence has the advantage of drawing on years of records. The limitation is usually time: a busy NHS surgery may not be able to give the task the hour or more that a properly structured functional letter takes. An independent GP can assess you specifically for the purpose and write around the criteria the assessor is applying.

Do I need a diagnosis before you can write a letter?

Not always. Where a condition is undiagnosed or still under investigation, the letter can describe the functional impact and the current diagnostic position honestly, including what remains uncertain. Assessors deal with uncertainty regularly. What they cannot deal with is a letter that hides it.

Will one letter cover several applications?

Sometimes, but be careful. A letter written around blue badge criteria may not address what a university disability service needs. It is usually better to tell the doctor every purpose at the outset so the letter covers each properly.

How long is a letter valid for?

There is no fixed period. Most assessors want evidence from the last 6 to 12 months, and a fluctuating or progressive condition may need updating sooner. If your circumstances have changed materially, the letter should be revised rather than reused.

How to arrange an assessment

Clinique Alpa provides disability supporting letters written by Dr Mitesh Parmar, a GMC registered and MedCo registered GP with a parallel medico legal practice. Assessments are currently by secure video.

Before the appointment, gather any correspondence from the body you are applying to, the criteria they have published if you can find them, your medication list, clinic and hospital letters, and if you can manage it, a fortnight of notes on how you actually managed day to day.

Start with our medical reports page, or book an online GP consultation to discuss what you need. To ask about fees and availability, telephone 020 8882 8088.

Dr Mitesh Parmar, Principal GP and Clinical Director at Clinique Alpa. MBBS MRCGP, GMC number 6113670.