Bipolar II Disorder ICD 10 Code is classified as F31.81 in the US healthcare coding system. Perhaps, you may have encountered this code on your prescription, your discharge notes, and even on your insurance documents and wanted to know what it means for you or a loved one. This article explains what the code means in layman’s language, its symptoms, and treatment in India.
What Is Bipolar II Disorder ICD 10?
ICD stands for the International Classification of Diseases. This is the common language that doctors and insurance companies use in diagnosing the disease, although each country uses its own classification system. This is why a simple Google search might return contradictory results.
WHO’s ICD-10 classification classifies Bipolar II disorder within a larger category, while the American one allocates a unique code for it. Here is the comparison of the two classifications:
Systems | Codes | How Bipolar II Is Listed |
ICD-10-CM (US) | F31.81 | Own specific code, accepted for billing |
WHO ICD-10 | F31.8 | Grouped under other bipolar disorders |
ICD-11 | 6A61 | Separate category for bipolar type II |
DSM-5-TR | F31.81 | Same as the US code |
Why Bipolar II Has Just One Code
Bipolar I is split into many codes depending on the current mood state and how severe it is. Bipolar II is simpler. Once a doctor confirms it, the same code is used whether you are low, elevated or feeling steady.
This leads to two practical rules:
F31.9 means "bipolar disorder, unspecified" and is only a temporary label.
Once Bipolar II is confirmed, your records should switch to F31.81.
What Is Bipolar II Disorder?
Bipolar II disorder is characterized by two distinct types of episodes, namely severe depressions and shorter bursts of increased energy called hypomanias. A person who experiences hypomania feels unusually energized, talkative, or irritable, and this state is noticeable to others. This condition is not serious enough to result in a breakdown or hospitalization.
The distinguishing aspect of this mood disorder is its absence. That is, patients with Bipolar II do not have manic episodes. The reason is that hypomanias may be experienced as an excellent week. People seek treatment for their lows but ignore their highs. As a result, the disorder is treated as regular depression.
Bipolar II Disorder Symptoms You Should Know
The symptoms swing between two very different states. Each lasts for a minimum period, and each one affects sleep, energy and judgment in its own way.
Hypomanic phase (lasting 4 days or more):
Needing only 3 to 4 hours of sleep and still feeling energetic
Thoughts that jump quickly from one idea to the next
Talking faster or more than usual
Unusual self-belief and a flood of new plans
Spending sprees or reckless decisions
Getting annoyed quickly
Depressive phase (lasting 2 weeks or more):
A low, empty or hopeless mood that does not lift
No interest in things you normally enjoy
Sleeping far too much or too little
Constant tiredness
Difficulty concentrating
Changes in appetite or weight
Thoughts of death or suicide
Think of a woman of 27 years old, who takes an entire month trying to cope with her daily routine. She gets only four hours of sleep for ten days, works on three projects at once and racks up her credit cards. The two cycles of therapy for depression didn’t help her. You can find a broader explanation in this overview of bipolar disorder symptoms, medicines and treatment.
Bipolar 1 vs Bipolar 2: What Sets Them Apart
People often ask which type is more serious. The honest answer is that they cause different kinds of difficulty. Bipolar I brings full mania, while Bipolar II brings milder highs but heavier depression.
Features | Bipolar I | Bipolar II |
Elevated phase | Mania, 7 days or more | Hypomania, 4 days or more |
Hospital care during highs | Sometimes needed | Rarely needed |
Depression | Common | Required for diagnosis, often the main struggle |
Psychosis | Possible during mania | Uncommon |
ICD-10-CM codes | Many | One (F31.81) |
Bipolar II should never be treated as the "light" form. Its low phases can run longer and affect work, studies and relationships just as deeply.
How Common Is Bipolar II Disorder?
The Bipolar II disorder is one of the most common diseases in the world and it is frequently misdiagnosed when compared with others.
This disorder affects about 1 percent of the whole adult population in the course of their lifetime.
The prevalence in India is relatively low – around 3 out of 1,000 adults. However, taking into account the poor state of research in this area, this number might be rather underestimated.
Six to ten years may elapse from the moment of the first appearance of symptoms until proper diagnosis.
Generally speaking, the patient tends to seek help while being in the depressed state, which can result in hypomania after taking a single antidepressant.
How Is Bipolar II Disorder Diagnosed?
No blood test or scan can confirm Bipolar II. A psychiatrist reaches the diagnosis through a long, careful conversation about your mood history, and often speaks with family members as well.
A proper psychiatric assessment and diagnosis usually covers these areas:
A timeline of past highs and lows, including how long each lasted.
A check against the DSM-5-TR criteria: at least one hypomanic episode, at least one major depressive episode, and no history of mania.
Tests to rule out thyroid problems, substance effects, ADHD and anxiety
Questions about relatives with mood disorders.
Observations from family or close friends, who often notice the high phases first.
Why the Right Code Matters
A diagnosis code may look like paperwork, but it shapes the care you receive. It travels with your records from one doctor to the next and decides how a claim is handled.
It points the doctor toward the right medicines, since Bipolar II is not treated like standard depression.
It helps insurance claims go through without mismatches.
It keeps your history consistent across hospitals and clinics.
How Is Bipolar II Treated in India?
This is considered a highly treatable form of bipolar disorder, and with various treatments, many do well. Typically, a psychiatrist develops a treatment plan that centers on medication, therapy, and behavior modification.
Medications, mood stabilizers, that are tailored according to your needs by your psychiatrist.
Therapy that teaches you how to identify symptoms before an episode occurs.
A structured schedule for sleeping, eating, and activities.
Inpatient care during an acute episode.
Therapy is especially useful for catching small shifts in sleep and energy early, and psychotherapy and counselling can be started alongside medication. Those with frequent relapses or severe episodes often do better at a bipolar disorder treatment centre than with occasional clinic visits.
Bipolar Disorder Treatment at Athena Behavioral Health
Athena Behavioral Health treats mood disorders through psychiatrists who work with both Bipolar I and Bipolar II..
Care moves through five stages:
A detailed psychiatric evaluation to confirm the diagnosis.
Supervised inpatient care for severe episodes.
Medicine adjustment until the right balance is found.
Therapy that teaches you to read your own warning signs.
Regular follow-up visits to prevent relapse.
Families can also expect:
Psychiatrists skilled at telling bipolar disorder apart from depression.
Separate wards for men, women and mixed groups.
Sessions that help relatives understand the condition.
Private, respectful care.
Centres in Gurgaon, Delhi, Greater Noida and Guwahat.i
When to See a Psychiatrist
Waiting rarely helps with mood disorders, because episodes tend to return and deepen. If any of the signs below sound familiar, book a consultation soon.
A low mood that has lasted longer than 2 weeks.
Repeated stretches of high energy with very little sleep.
No improvement, or new restlessness, after starting an antidepressant.
Mood changes that are hurting your job, studies or relationships.
Any thought of self-harm, which needs help the same day.
