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Headache ICD 10 with All History of Codes

A woman holding her head with a headache
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Overview

Headache ICD 10 refers to the diagnosis codes used to record headaches in medical records and insurance claims. A headache is pain in any part of the head.

In the United States, the general code for a headache with no more specific diagnosis is R51.9 (Headache, unspecified). Specific headache disorders, such as migraine or cluster headache, have their own codes. ICD codes record a diagnosis; they don't make one.

Cad ICD 10-CM by World Health Organization

What Is Headache ICD 10?

ICD stands for the International Statistical Classification of Diseases and Related Health Problems, created by the World Health Organization. The United States uses its own expanded version for diagnoses, called ICD-10-CM.

Under HIPAA, all covered health care providers, health plans and clearinghouses use these codes. Codes give every diagnosis a standard label, which supports billing, record keeping and health statistics.

What Is the History of the Code?

The US health care industry switched from ICD-9 to ICD-10 codes on October 1, 2015, as required for all parties covered by HIPAA (Health Insurance Portability and Accountability Act). The code set is updated every fiscal year, with new codes taking effect each October 1.

Key points in the history of the headache code:

  • Fiscal 2016 through 2020 code sets: headache was coded as R51 (Headache), a single billable code, with no changes.
  • Fiscal 2021 update: R51 was split into two codes: R51.0 (Headache with orthostatic component, not elsewhere classified) and R51.9 (Headache, unspecified). R51 itself is no longer billable.
  • Since then: R51.0 and R51.9 remain the codes in use.

Clinical Information: Headache Types and Their Codes

Many headache types have their own ICD-10-CM codes. Doctors should use the most specific code that fits the diagnosis:

  • CLUSTER HEADACHE

Cluster headache causes severe pain on one side of the head, around or above the eye or at the temple. Attacks last 15 to 180 minutes and can occur from once every other day up to 8 times a day.

On the same side, people may have a red or watery eye, a stuffy or runny nose, a swollen eyelid or facial sweating. Cluster headache is coded under G44.0 (for example, G44.009 for unspecified, not intractable).

  • MIGRAINE

Migraine is a disorder that causes recurring, often throbbing headaches. In migraine without aura, the headache comes without warning symptoms. In migraine with aura (once called classic migraine), visual changes such as flashing lights or blind spots, or other symptoms, come before the headache. Migraine is coded under G43 (for example, G43.909 for migraine, unspecified).

  • TRIGEMINAL NEURALGIA

Trigeminal neuralgia causes sudden, electric-shock-like facial pain along the trigeminal (fifth cranial) nerve. Attacks can be set off by light touch, chewing or talking. It is usually treated with medicines, and sometimes with procedures or surgery. It is a nerve disorder rather than a headache, coded G50.0.

  • VASCULAR HEADACHE

Vascular headache is an older term for headaches thought to involve blood vessels in the head. ICD-10-CM has a code for vascular headache not elsewhere classified, G44.1. Headaches from bleeding in or around the brain are emergencies and are coded by their cause.

  • TENSION HEADACHE

Tension-type headache is the most common type. It feels like a tight band or pressure around the head and is usually mild to moderate. Stress is a common trigger, though the exact cause isn't fully known. It is coded under G44.2 (for example, G44.209).

  • PRIMARY HEADACHE

A primary headache is a headache disorder on its own, not caused by another condition. Migraine, tension-type and cluster headaches are primary headaches.

  • SECONDARY HEADACHE

A secondary headache is caused by another condition, such as a head injury, infection, high blood pressure or medication overuse or withdrawal. Drug-induced headache, for example, is coded under G44.4.

  • POST TRAUMATIC HEADACHE

This headache follows an injury to the head or neck. It is coded under G44.3 (for example, G44.309).

  • SPINAL HEADACHE

A spinal headache can follow a lumbar puncture (spinal tap) or spinal anesthesia, when fluid leaks from the puncture site. It typically worsens when sitting or standing and eases when lying down.

Rest, fluids and caffeine may help. If it doesn't improve, a doctor may perform an epidural blood patch. It is commonly coded as G97.1 (other reaction to spinal and lumbar puncture).

How Do These Codes Help Medical Practitioners?

The WHO maintains the international ICD, while US clinical codes are maintained by federal agencies. Codes don't diagnose or treat anything. They let doctors, hospitals and insurers describe a diagnosis the same way, which supports billing, research and tracking of disease patterns.

HP Thoughts: We’ll introduce you to some of the most common forms of headaches starting with this one: Dehydration Headache.

The Final Words

The ICD system comes from the World Health Organization, and the US uses its ICD-10-CM version for diagnosis codes. For a headache without a more specific diagnosis, the code is R51.9. Migraine, tension-type, cluster and post-traumatic headaches have their own, more specific codes.

If you have sudden, severe or unusual headaches, see a doctor; coding only records a diagnosis.

Sources

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