Difference Between Type 1 and Type 2 Diabetes

What Is Diabetes?

Diabetes mellitus, commonly called diabetes, is a long-term health condition in which the level of glucose, or sugar, in the blood becomes too high. Glucose is an important source of energy for the body. A hormone called insulin, which is produced by the pancreas, helps glucose move from the bloodstream into the body’s cells.

Diabetes develops when the body does not produce enough insulin, produces no insulin, or cannot use insulin effectively. As a result, glucose remains in the bloodstream instead of entering the cells. Over time, uncontrolled high blood sugar can damage the heart, blood vessels, eyes, kidneys, nerves, and other organs.

Diabetes is a major global health concern. According to the World Health Organization, hundreds of millions of people worldwide are living with diabetes, and many do not receive adequate treatment.

Main Types of Diabetes

1. Type 1 Diabetes

Type 1 diabetes is an autoimmune condition. It occurs when the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body produces little or no insulin.

Type 1 diabetes can develop at any age, although it is often diagnosed during childhood or adolescence. People with type 1 diabetes need insulin every day to control their blood glucose and stay healthy. Type 1 diabetes is not caused by eating too much sugar, and there is currently no established way to prevent it.

2. Type 2 Diabetes

Type 2 diabetes is the most common type of diabetes. It develops when the body becomes resistant to insulin or when the pancreas cannot produce enough insulin to maintain healthy blood glucose levels.

Type 2 diabetes often develops gradually and may remain unnoticed for several years. Factors such as family history, physical inactivity, excess body weight, increasing age, and certain health conditions may increase the risk. However, diabetes is a complex condition and should not be blamed on any single factor.

Healthy lifestyle changes may help prevent or delay type 2 diabetes in many people, especially those with prediabetes.

3. Gestational Diabetes

Gestational diabetes develops during pregnancy in people who did not previously have diabetes. Pregnancy-related hormonal changes can make it more difficult for the body to use insulin effectively.

Gestational diabetes may not cause noticeable symptoms and is usually identified through routine screening during pregnancy. It can increase the risk of complications during pregnancy and delivery. It may also increase the future risk of type 2 diabetes for both the mother and the child.

4. Prediabetes

Prediabetes means that blood glucose levels are higher than normal but not high enough to meet the criteria for diabetes.

People with prediabetes have an increased risk of developing type 2 diabetes and cardiovascular disease. Prediabetes often has no clear symptoms. However, progression to type 2 diabetes is not inevitable, and healthy lifestyle changes may significantly reduce the risk.

Common Symptoms of Diabetes

Symptoms may develop quickly in type 1 diabetes but can appear slowly or remain mild in type 2 diabetes.

Common symptoms include:

· Increased thirst

· Frequent urination

· Increased hunger

· Unexplained weight loss

· Tiredness or weakness

· Blurred vision

· Slow-healing cuts or wounds

· Frequent infections

· Numbness or tingling in the hands or feet

· Irritability or changes in mood

Some people, particularly those with type 2 diabetes or prediabetes, may have no noticeable symptoms.

Risk Factors for Type 2 Diabetes

A person may have a greater risk of developing type 2 diabetes when they have one or more of the following factors:

· A family history of diabetes

· Prediabetes

· Low levels of physical activity

· Excess body weight

· Increasing age

· A previous history of gestational diabetes

· High blood pressure

· Abnormal cholesterol levels

· Certain hormonal or metabolic conditions

Having a risk factor does not mean that a person will definitely develop diabetes. Regular health checkups and early testing may help identify changes in blood glucose before complications develop.

How Is Diabetes Diagnosed?

Diabetes is diagnosed through blood tests. Common tests include:

A1C or HbA1c Test

The A1C test estimates the average blood glucose level during the previous two to three months.

· Normal: Below 5.7%

· Prediabetes: 5.7%–6.4%

· Diabetes: 6.5% or higher

Fasting Plasma Glucose Test

This test measures blood glucose after fasting for at least eight hours.

· Normal: Below 100 mg/dL

· Prediabetes: 100–125 mg/dL

· Diabetes: 126 mg/dL or higher

Oral Glucose Tolerance Test

Blood glucose is measured before and two hours after drinking a glucose-containing liquid.

· Normal: Below 140 mg/dL

· Prediabetes: 140–199 mg/dL

· Diabetes: 200 mg/dL or higher

Random Blood Glucose Test

A random blood glucose level of 200 mg/dL or higher may indicate diabetes when typical symptoms are also present. Diagnosis is usually confirmed with additional testing unless symptoms and test results are clear.

Treatment and Management

Diabetes management depends on the type of diabetes, blood glucose levels, age, overall health, and other medical conditions.

Healthy Eating

A balanced eating pattern may help maintain stable blood glucose levels. A healthy diet may include:

· Vegetables

· Whole grains

· Fruits

· Beans and other sources of dietary fibre

· Lean sources of protein

· Healthy fats

· Appropriate portion sizes

People with diabetes do not necessarily need to avoid carbohydrates or all sweet foods completely. The amount, quality, and timing of food may affect blood glucose levels. Individual dietary advice should be obtained from a qualified healthcare professional or registered dietitian.

Physical Activity

Regular physical activity can improve the body’s response to insulin and may help manage blood glucose, blood pressure, sleep, and overall health. Health organizations generally recommend at least 150 minutes of moderate physical activity each week for adults. However, the appropriate type and amount of activity may differ according to age and health condition.

Medicines

Diabetes medicines may include:

· Insulin

· Metformin· Sulfonylureas

· SGLT2 inhibitors

· Other oral or injectable medicines

People with type 1 diabetes require insulin. Some people with type 2 diabetes can initially manage their condition through lifestyle changes, while others may need tablets, injectable medicines, or insulin. Treatment should always be selected and monitored by a healthcare professional.

Blood Glucose Monitoring

Some people may need to check their blood glucose using a glucose meter or continuous glucose monitor. Monitoring can help show how food, physical activity, illness, stress, and medicines affect blood glucose.

Blood glucose targets are individualized. Many adults with diabetes aim for:

· Before meals: 80–130 mg/dL

· Around two hours after a meal begins: Below 180 mg/dL

These targets may be different for children, pregnant people, older adults, or people with other medical conditions.

Possible Complications

Long-term uncontrolled diabetes may increase the risk of:

· Heart disease

· Heart attack

· Stroke

· Kidney disease

· Vision problems and diabetic retinopathy

· Nerve damage

· Foot ulcers

· Infections

· Slow wound healing

· Dental and gum problems

Good blood glucose management, regular medical care, healthy daily habits, and management of blood pressure and cholesterol may reduce the risk or delay the development of complications.

Preventing or Delaying Type 2 Diabetes

Type 1 diabetes cannot currently be prevented, but many cases of type 2 diabetes may be delayed or prevented.

Helpful habits include:

· Eating a balanced and nutritious diet

· Staying physically active

· Maintaining a healthy weight that is appropriate for the individual

· Avoiding tobacco use

· Getting regular health checkups

· Checking blood glucose when recommended

· Managing blood pressure and cholesterol

People with prediabetes may significantly reduce their risk through consistent lifestyle changes and appropriate medical guidance.

What foods must be avoided by diabetes patients to keep blood sugar under control?

Refined carbs, sugar-sweetened beverages, and ultra-processed foods elicit fast spikes in glucose that no longer can be managed by the body's insulin function. Some of the most common offenders are white bread, sweetened juices, pastries, and flavoured yoghurts. Even so-called healthy foods—granola bars or fruit smoothies, for example—can have a glycemic load that destabilises your baseline.

Aim for a diet high in whole grains, vegetables rich in fibre, lean proteins and good fat types. These types of macronutrient combinations are gradually absorbed for glucose and support cumulative metabolic determinism.

Does stress make diabetes management more difficult?

Cortisol, a hormone that directly elevates blood glucose and contributes to insulin resistance, is released with chronic psychological stress. Uncontrolled stress compounds metabolic dysfunction on a biochemical level among diabetes patients.

Diaphragmatic breathing, progressive muscle relaxation and mindfulness meditation are all structured stress-reduction practices which have been associated with clinically meaningful reductions in HbA1c levels. It is physiologically not optional to treat emotional health as if it was separate or unintegral from metabolic health.

When to Seek Medical Care

A healthcare professional should be consulted when a person experiences persistent thirst, frequent urination, unexplained weight loss, blurred vision, unusual tiredness, slow-healing wounds, or repeated infections.

Urgent medical attention may be necessary when a person with diabetes develops severe weakness, confusion, fainting, repeated vomiting, difficulty breathing, or extremely high or low blood glucose. Severe low blood glucose and diabetic ketoacidosis can become medical emergencies.

Conclusion

Diabetes is a serious but manageable health condition. Early diagnosis, regular monitoring, balanced nutrition, physical activity, appropriate medication, and ongoing medical care can help people with diabetes maintain good health and reduce the risk of complications.

Awareness and regular screening are especially important because type 2 diabetes and prediabetes may develop without obvious symptoms. Proper treatment and healthy daily habits can allow many people with diabetes to live active and fulfilling lives.

Frequently Asked Questions

Can diabetes patients drink alcohol?

Alcoholic beverages can lead to hypoglycemia as well as hyperglycemia, and their effects depend on the type of drink and the amount consumed. Moderation is paramount; alcohol should never be drunk without food. Talk to your doctor before drinking.

Is fruit good for diabetics?

Some whole fruits which are lower on the glycemic index, including berries and apples as well as pears, are generally acceptable in small portions. Although fruit juices are concentrated sugar nevertheless devoid of fibre, so their consumption ought to be banned.

Do diabetics need to exercise every day?

Daily movement is great, but it matters more that you do some sort of exercise every day rather than just going super hard for an hour here and there. Add up to 150 minutes of moderate activity spread out over most days of the week and add aerobic and resistance training exercises.

What is the main ICD-10 code for diabetes mellitus type 2?

The main code is E11.9, which means type 2 diabetes mellitus without complications.

What is the ICD-10 code for type 2 diabetes with hyperglycemia?

The code is E11.65.

What is the code for type 2 diabetes with kidney disease?

E11.22 is used for type 2 diabetes mellitus with diabetic chronic kidney disease. An additional N18.- code is usually required to identify the CKD stage.

What is the code for type 2 diabetes with neuropathy?

The code depends on the type of neuropathy. E11.40 represents unspecified diabetic neuropathy, while E11.42 represents diabetic polyneuropathy.

What is the ICD-10 code for type 2 diabetes with a foot ulcer?

The combination code is E11.621. An additional code normally describes the ulcer’s location and severity.

Is E11.9 used for controlled diabetes?

E11.9 may be appropriate when type 2 diabetes is documented without a complication. The word “controlled” alone does not necessarily determine the code. The complete provider documentation should be reviewed.

Does insulin use change E11.9 to a type 1 diabetes code?

No. A person with type 2 diabetes may use insulin. Long-term insulin use may be additionally reported with Z79.4, but insulin use alone does not change the diabetes type to type 1.

What is the new code for type 2 diabetes in remission?

The FY 2026 code is E11.A, meaning type 2 diabetes mellitus without complications in remission. It requires clear provider documentation.

Can a patient have more than one E11 code?

Yes. More than one E11.- code may be assigned when a patient has multiple documented diabetes-related complications. The official guidelines allow as many codes as necessary to identify all associated conditions.

Medical Disclaimer: This information is provided for general education only. It should not replace diagnosis, treatment, or advice from a qualified doctor or healthcare professional.

References

1. World Health Organization (WHO). Diabetes – Fact Sheet.
   World Health Organization provides global information about diabetes, including types, symptoms, prevention, diagnosis, and complications.
   Available at: https://www.who.int/news-room/fact-sheets/detail/diabetes

2. Centers for Disease Control and Prevention (CDC). About Diabetes.
   CDC provides evidence-based information on diabetes causes, risk factors, symptoms, diagnosis, and disease management.
   Available at: https://www.cdc.gov/diabetes/about/index.html

3. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Diabetes Overview.
   National Institutes of Health (NIH), USA. Information on diabetes types, insulin function, treatment approaches, and prevention strategies.
   Available at: https://www.niddk.nih.gov/health-information/diabetes/overview

4. American Diabetes Association (ADA). Standards of Care in Diabetes.
   The ADA publishes clinical guidelines on diabetes diagnosis, classification, prevention, monitoring, and treatment.
   Available at: https://diabetes.org/standards-of-care

5. International Diabetes Federation (IDF). Diabetes Atlas.
   Provides global statistics, epidemiological data, and information about the worldwide impact of diabetes.
   Available at: https://diabetesatlas.org/

6. American Diabetes Association (ADA). Diagnosis and Classification of Diabetes.
   Provides diagnostic criteria including HbA1c, fasting plasma glucose, oral glucose tolerance testing, and diabetes classification.
   Available at: https://diabetes.org/about-diabetes/diagnosis

7. World Health Organization (WHO). Guidelines on Physical Activity and Sedentary Behaviour.
   Provides recommendations regarding physical activity and its role in preventing and managing chronic diseases, including diabetes.
   Available at: https://www.who.int/publications/i/item/9789240015128

8. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Managing Diabetes.
   Provides information on blood glucose monitoring, lifestyle management, medications, and reducing diabetes-related complications.
   Available at: https://www.niddk.nih.gov/health-information/diabetes/overview/managing-diabetes

9. European Association for the Study of Diabetes (EASD) and American Diabetes Association (ADA). Management of Hyperglycemia in Type 2 Diabetes.
   Evidence-based recommendations for glucose-lowering therapy and comprehensive diabetes management.
   Available at: https://diabetesjournals.org/care

10. International Diabetes Federation (IDF). Clinical Practice Recommendations for Diabetes Care.
    Provides clinical guidance for diabetes prevention, diagnosis, and treatment worldwide.
    Available at: https://idf.org/4